Question: What is the minimum age to buy a handgun in the state where Hickory Hill Park is located?

full_context: Document 1: Revis Hill Prairie: Revis Hill Prairie State Natural Area, also known as "Revis Hill Prairie Nature Preserve", is a state park located six miles south of Easton in Mason County, Illinois. It is operated by the Illinois Department of Natural Resources (IDNR) as a tallgrass prairie nature preserve and as a fish and wildlife area managed for deer hunting.
Document 2: Oklahoma City: Oklahoma City has a major park in each quadrant of the city, going back to the first parks masterplan. Will Rogers Park, Lincoln Park, Trosper Park, and Woodson Park were once connected by the Grand Boulevard loop, some sections of which no longer exist. Martin Park Nature Center is a natural habitat in far northwest Oklahoma City. Will Rogers Park is home to the Lycan Conservatory, the Rose Garden, and Butterfly Garden, all built in the WPA era. Oklahoma City is home to the American Banjo Museum, which houses a large collection of highly decorated banjos from the early 20th century and exhibits on the history of the banjo and its place in American history. Concerts and lectures are also held there.
Document 3: Gun laws in Tennessee: A license is required to carry a loaded handgun either openly or concealed. Such permits are issued through the Department of Safety to qualified residents 21 years or 18 years old if the applicant is active duty, reservist, guardsman, or honorably discharged from their branch of service, DD - 214 must mention 'pistol qualification' in order to be exempt from 8 hour safety course must have a valid military ID. The length of the term for the initial license is determined by the age of the applicant. If renewed properly and on time, the license is renewed every 5 years. Tennessee recognizes any valid, out - of - state permit for carrying a handgun as long as the permittee is not a resident of Tennessee. Nonresidents are not issued permits unless they are regularly employed in the state. Such persons are then required to obtain Tennessee permits even if they have home state permits unless their home state has entered into a reciprocity agreement with Tennessee. Permittees may carry handguns in most areas except civic centers, public recreation buildings and colleges. Businesses or landowners posting ``no carry ''signs may prohibit gun carry on any portion of their properties.
Document 4: Gun laws in Ohio: In April 2004, Ohio became the 46th state to legalize concealed carry and its statute went into effect. The law (Ohio Revised Code (O.R.C.) 2923.12, et seq.) allows persons 21 and older to receive a concealed handgun license provided that they receive a minimum of 8 hours of handgun training (6 hours of classroom instruction and 2 hours of range time) from a certified instructor, demonstrate competency with a handgun through written and shooting tests, pass a criminal background check, and meet certain residency requirements (non-residents who work in Ohio will be allowed to obtain licenses as of March 23, 2015).
Document 5: Beall Woods State Park: Beall Woods State Park is an Illinois state park on bordering the Wabash River and Keensburg in Wabash County, Illinois in the United States. of the state park is an old-growth forest designated as a "Natural Area" by the state of Illinois. The trees within the forest consist overwhelmingly of hardwoods of the former Eastern Woodlands ecosystem. Portions of Beall Woods State Park have been designated a National Natural Landmark as the "Forest of the Wabash". The state park was created in 1966. The nearest towns with any sizable commercial infrastructure, including hotels and grocery stores, are Grayville and Mount Carmel. The park does host a small primitive campground and maintains a visitor center which opened in April 2001. The park maintains of hiking trails, primarily through the Forest of the Wabash portion of the park.
Document 6: Possum Woods Conservation Area: The area had been used at various times as an exotic animal breeding area for the St. Louis Zoo, a resort, public swimming pool, and tennis club. The land was purchased by real estate developer Russell. E. Emmenegger in the 1970s before he donated it to the city of Kirkwood. The land is currently leased by the Missouri Department of Conservation. Dogs are allowed on a leash.
Document 7: Hickory Hill Park: Hickory Hill Park is a large natural area in northeast Iowa City, Iowa consisting of of forest, abandoned fields, reconstructed prairie, wetlands, and parkland centered on Ralston Creek and its tributary drainages. It is owned and administered by the city, with help from Friends of Hickory Hill Park. The park is popular with day hikers, dog walkers, cross-country skiers, sledders, and picnickers.
Document 8: Gun laws in Arizona: Arizona gun laws are found mostly in Title 13, Chapter 31 of the Arizona Revised Statutes. There is no registration or licensing of non-NFA firearms in Arizona. Section 13 - 3108 subsection B prohibits any political subdivision of the state from enacting any laws requiring licensing or registration. According to state law, a person must be 18 years of age to purchase any non-NFA firearm from any source; however, there is a federal age limit of 21 years on handgun purchases from federal firearms licensees.
Document 9: Gun laws in Iowa: A Permit To Acquire (PTA), obtained from the sheriff of the county of the applicant's residence, is required when purchasing or otherwise acquiring a handgun, either from a dealer or from a private party. A Permit To Acquire shall be issued to qualified applicants aged 21 or older. The PTA becomes valid three days after the date of application, and is valid for one year. A PTA is not required when purchasing an antique handgun, defined as one made in or before 1898 and including post-1898 replicas of matchlock, flintlock, or percussion cap pistols.
Document 10: Gun laws in Texas: The Texas handgun carry permit was previously called a ``Concealed Handgun License ''or CHL. This has changed on Jan 1. 2016 to LTC`` License To Carry'' and at the same time the laws changed to include ``Open Carry ''. Permits are issued on a non-discretionary (`` shall - issue'') basis to all eligible, qualified applicants. Texas has full reciprocity agreements with 30 states, not including Vermont (which is an ``unrestricted ''state and neither issues nor requires permits), most of these having some residency restrictions (the holder must either be a resident of Texas or a non-resident of the reciprocal state for the Texas license to be valid in that state). Texas recognizes an additional 11 states' concealed - carry permits unilaterally; those states do not recognize Texas' own permit as valid within their jurisdiction, usually due to some lesser requirement of the Texas permit compared to their own.
Document 11: Gun laws in Indiana: Indiana is a ``shall issue ''state for the License To Carry a Handgun. A license to carry will be issued to individuals age 18 or older who meet a number of legal requirements. Currently both limited term and unlimited lifetime licenses are available.
Document 12: Gun laws in Washington: As a general rule, a person may legally open - carry in Washington state in any place it is legal to possess a loaded handgun, as long as it does not manifest ``an intent to intimidate another or (warrant) alarm for the safety of other persons. ''To open - carry a handgun in a vehicle (e.g, car, bus, etc...) a person must have a valid concealed pistol license. The county sheriff or city police chief shall issue a concealed pistol license to any applicant, age 21 or older, who meets certain requirements, including no felony convictions, no misdemeanor domestic violence convictions, and no outstanding warrants. Open carrying of firearms is not prohibited by law, although trouble with some law enforcement agencies has been encountered while open carrying in the past, most notably in a case in Ellensburg, Washington.
Document 13: Gun laws in Michigan: At the age of 18 or up, it is legal to buy a pistol with a purchase license from a private seller, at the age of 21, it is legal to buy a firearm from a Federally licensed (FFL) dealer. No purchase license is required to purchase a long gun (a firearm that is more than 26 inches long) in Michigan. According to state law, a long gun may be purchased by anyone aged 18 or over who is not subject to restrictions based on criminal history, mental health history, or other disqualifying factor. A person must be at least 18 years old to purchase a long gun from a federal dealer or a private seller under Michigan law.
Document 14: New York City: There are seven state parks within the confines of New York City, including Clay Pit Ponds State Park Preserve, a natural area which includes extensive riding trails, and Riverbank State Park, a 28-acre (110,000 m2) facility that rises 69 feet (21 m) over the Hudson River.
Document 15: Oklahoma City: Walking trails line Lake Hefner and Lake Overholser in the northwest part of the city and downtown at the canal and the Oklahoma River. The majority of the east shore area is taken up by parks and trails, including a new leashless dog park and the postwar-era Stars and Stripes Park. Lake Stanley Draper is the city's largest and most remote lake.
ground_truth: 21 or older.
sub_queries: In which state is Hickory Hill Park located? Answer: Iowa
how old do you have to be to buy a handgun in Iowa Answer: 21 or older.