The bass player admits age is taking its toll on him and he doesn't think he has many live treks left in him.
He tells the new issue of Rolling Stone magazine, "I'm 64 now. Three more tours. Two, if I have a life change of some kind."
Simmons and Kiss co-founder Paul Stanley will hit the road with Def Leppard this summer (14). They'll also headline a big gig for fans of their new Los Angeles arena football team L.A. Kiss.