Question: What sport do both the Hanbury Manor and Willow Senior Golf Classic have in common?
Context: The Philips PFA Golf Classic was a senior (over 50s) men's professional golf tournament on the European Senior Tour.  It was played from 1997 to 1999.  In 1998 and 1999 the tournament was held at Meon Valley Country Club, Shedfield, Hampshire, while in 1997 it was held at St Pierre Golf & Country Club, near Chepstow, Wales The Puerto Vallarta Blue Agave Golf Classic was a Champions Tour golf tournament played only in 2006.  It was played at the Vista Vallarta Club de Golf in the resort of Puerto Vallarta, Mexico over a course which was designed by Jack Nicklaus.  It was the only Champions Tour event in Mexico in 2006, and was the richest golf tournament of any kind to be staged in that country.  A richer PGA Tour event called the Mayakoba Golf Classic at Riviera Maya-Cancun debuted in 2007.  Morris Hatalsky won the tournament, taking the winner's US$240,000 share of the $1,600,000 purse. Men's professional senior golf is for players aged 50 and above.  Golf differs from all other sports in having lucrative competitions for this age group.  The leading senior tour is the U.S. based Champions Tour, which was established in 1980 (as the Senior PGA Tour).  It has established a roster of five major championships.  These events are all played over four rounds, whereas other senior tournaments are generally played over three rounds—only one other current Champions Tour event, the limited-field and season-ending Charles Schwab Cup Championship, is played over four rounds.  A golfer's performances can be quite variable from one round to the next, so playing an extra round increases the likelihood that the senior majors will be won by leading players. The Sharjah Senior Golf Masters presented by Shurooq is a men's senior (over 50) professional golf tournament on the European Senior Tour.  It will be held for the first time from 16 to 18 March 2017 at Sharjah Golf and Shooting Club, Sharjah, United Arab Emirates.  Total prize money is €425,000.  It will be the first European Senior Tour event held in the United Arab Emirates since the Abu Dhabi European Seniors Tour Championship in 2000. The Japan Senior Open Golf Championship is one of the major championships in Japanese men's senior golf.  It is administered by the Japan Golf Association (JGA) and is recognised as a major championship by the PGA of Japan Senior Tour.  It was founded in 1991. The Willow Senior Golf Classic is a men's senior (over 50) professional golf tournament on the European Senior Tour.  It was held for the first time in September 2016 at Hanbury Manor Country Club, Ware, Hertfordshire, England.  The event raises money for the Willow Foundation.  The winner was Gary Marks who won the first prize of £52,500 out of total prize-money of £350,000. Hanbury Manor, centred on multi-wing hotel Hanbury Manor Hotel is a converted late Victorian mansion and adjoining golf course, occupying a historic mansion site in Thundridge north of Ware, Hertfordshire and is part of a leisure retreat and country club owned by Marriott Hotels, centred 10 mi north of Greater London. The U.S. Senior Open is one of the five major championships in senior golf, introduced in 1980.  It is administered by the United States Golf Association (USGA) and is recognized as a major championship by both the PGA Tour Champions and the European Senior Tour.  The lower age limit was 55 in 1980, but it was lowered to 50 for the second edition in 1981, which is the standard limit for men's senior professional golf tournaments.  By definition, the event is open to amateurs, but has been dominated by professionals; through 2016, all editions have been won by pros.  Like other USGA championships, it has been played on many courses throughout the United States. The Sunwest Bank Charley Pride Senior Golf Classic was a golf tournament on the Champions Tour from 1986 to 1991.  It was played in Albuquerque, New Mexico at the Four Hills Country Club. The Pacific Northwest Senior PGA Championship, also known as the PNW Senior PGA Championship, is a golf championship for senior players held annually, usually in September in the Pacific Northwest.  It is affiliated with the PGA of America.  The Senior PGA Professional Championship was established in 1952, although a Pacific Northwest Senior Golf Championship had existed long before then at an amateur level and was even won by a former tennis star Bernie Schwengers in 1943.  In the 1960s, it was held for years at the Yakima Elks' Golf and Country Club between 21 players with prize money of just $920.
Answer: golf