When did the Secret Service begin providing lifetime protection for ex-Presidents?

Factual Questions
1

I think it might have been for Truman, when he left office in 1953, but I can’t find it anywhere. I summon the mighty power of the SDMB!

I understand that the law changed not long ago and that Clinton and subsequent ex-Presidents will only have a decade of post-White House protection, but I suspect that it will be extended, particularly if the War on Terror or its equivalent drags on…

2

Nope. Cliton was grandfathered in. Bush will be the first ex-president not to have lifetime protection.

Lifetime protection of ex-presidents and their spouses began with an act of Congress in 1965. More here.

3

Thanks. In 1965, the only former presidents still alive would have been Truman and Eisenhower.