Title: Former Presidents Act
Content:  From 1965 to 1996, former presidents were entitled to lifetime Secret Service protection, for themselves, spouses, and children under 16. A 1994 statute,, limited post-presidential protection to ten years for presidents inaugurated after January 1, 1997. Under this statute, Bill Clinton would still be entitled to lifetime protection, and all subsequent presidents would have been entitled to ten years of protection. On January 10, 2013, President Barack Obama signed the Former Presidents Protection Act of 2012, reinstating lifetime Secret Service protection for his predecessor George W. Bush, himself, and all subsequent presidents. Richard Nixon relinquished his Secret Service protection in 1985, the only president to do so.
Title: President of the United States
Content:  Former presidents who served in Congress may also collect congressional pensions. The act also provides former presidents with travel funds and franking privileges. Prior to 1997, all former presidents, their spouses, and their children until age 16 were protected by the Secret Service until the president's death. In 1997, Congress passed legislation limiting Secret Service protection to no more than 10 years from the date a president leaves office. On January 10, 2013, President Obama signed legislation reinstating lifetime Secret Service protection for him, George W. Bush, and all subsequent presidents. A first spouse who remarries is no longer eligible for Secret Service protection.
Title: United States Secret Service
Content:  lead agency for the design and implementation of operational security plans for events designated a NSSE by the secretary of homeland security. There have been changes to the protection of former presidents over time. Under the original Former Presidents Act, former presidents and their spouses were entitled to lifetime protection, subject to limited exceptions. In 1994, this was amended to reduce the protection period to 10 years after a former president left office, starting with presidents assuming the role after January 1, 1997. On January 10, 2013, President Barack Obama signed legislation reversing this limit and reinstating lifetime protection to all former presidents. This 
Title: Presidency
Content:  For former presidents who had entered office before January 1, 1997 are entitled to lifetime protection carried out by The Secret Service. Protection of the president's spouse is also granted until death or in the case of remarriage. In 1984 the ability to decline Secret Service protection was enacted by legislation enacted. The costs of protecting former presidents and dependents are not publicized by the Secret Service due to security reasoning. Former presidents who entered office after January 1, 1997 are limited to ten years of protection for themselves and their spouses. A spouse’s protection ends upon divorce, remarriage, or the former president’s death. According to the 25th Amendment to the United States Constitution, the death of a president still active in office 
Title: Presidency
Content:  automatically entitles his or hers spouse to one year of protective services. However, authorization of protection can be issued by the Secretary of Homeland Security. Children of former presidents, up to the age of 16, are guaranteed the same services as long as the time period does not surpass 10 years. In addition to direct protection, the Secret Service was entitled to investigate any potential threats against the former presidents and their dependents by the Presidential Threat Protection Act passed in 2000. The act passed by the 106th Congress can be deciphered as so: To amend section 879 of title 18, United States Code, to provide clearer coverage over threats against former presidents and members of their families, and for other purposes.
Title: Former Presidents Act
Content:  Before 1958, the U.S. federal government provided no pension or other retirement benefits to former United States presidents. Andrew Carnegie offered to endow a US$25,000 (equal to $ today) annual pension for former chief executives in 1912, but congressmen questioned the propriety of such a private pension. That prompted legislation to provide benefits to former presidents. When the Former Presidents Act took effect, there were two living former presidents: Herbert Hoover and Harry S. Truman. Dwight D. Eisenhower was the first president to fall under the act upon leaving office. The original act provided for lifetime Secret Service protection for former presidents. In 1994, protection was reduced to ten years for presidents first taking office after 1996. This protection limitation was reversed in early 2013 by the Former Presidents Protection Act of 2012. All living former presidents and their spouses after Dwight D. Eisenhower are now entitled to receive lifetime Secret Service protection. Their children are entitled to protection "until they become 16 years of age".
Title: United States Secret Service
Content:  their spouses ; Former vice presidents, their spouses, and their children under 16 years of age, for up to 6 months from the date the former vice president leaves office (the Secretary of Homeland Security can authorize temporary protection of these individuals at any time after that period) The Secret Service combines the two responsibilities into a unique dual objective. The two core missions of protection and investigation synergize with the other, providing crucial benefits to special agents during the course of their careers. Skills developed during the course of investigations which are also used in an agent's protective duties include but are not limited 
Title: Vice President of the United States
Content:  of the United States Capitol, commemorating their service as presidents of the Senate. Dick Cheney is the most recent former vice president to be so honored. Unlike former presidents, whose pension is fixed at the same rate, regardless of their time in office, former vice presidents receive their retirement income based on their role as president of the Senate. Additionally, since 2008, each former vice president and their immediate family is entitled (under the Former Vice President Protection Act of 2008) to Secret Service protection for up to six months after leaving office, and again temporarily at any time thereafter if warranted.
Title: United States Secret Service
Content:  In 1968, as a result of Robert F. Kennedy's assassination, Congress authorized protection of major presidential and vice presidential candidates and nominees. In 1965 and 1968, Congress also authorized lifetime protection of the spouses of deceased presidents unless they remarry and of the children of former presidents until age 16.
Title: United States Secret Service
Content:  impacted Presidents Obama and G.W. Bush, as well as all future presidents. Protection of government officials is not solely the responsibility of the Secret Service, with many other agencies, such as the United States Capitol Police, Supreme Court Police and Diplomatic Security Service, providing personal protective services to domestic and foreign officials. However, while these agencies are nominally responsible for services to other officers of the United States and senior dignitaries, the Secret Service provides protective services at the highest-level – i.e. for heads of state and heads of government. The Secret Service's other primary mission is investigative; to protect the payment and financial 

Question: how long do former presidents get secret service protection?
Answer: lifetime protection.
lifetime.