[Gatorade]

Looks like I was right and wrong. It was life and in 1997 changed to 10 years then in 2012 changed back to life.

From Wikipedia:

The original act provided for lifetime Secret Service for former presidents. In 1997, it was reduced to 10 years for presidents taking office after 1997. The 1997 amendment was reverted by the Former Presidents Protection Act of 2012 (Public Law 112-257).[2] All living former presidents and their spouses are now entitled to receive lifetime Secret Service protection.[3]