Unless you have a serious handicap, you are never too old to start lifting. In fact, it's beneficial to older folks, because it builds bone mass and muscle, as well as strength and coordination. I just don't want to be one of those frail old ladies who fall off a curb and break a hip. Although it would be a big stretch to ever consider myself frail, because I'm big boned.
Really, I have the DEXA scan to prove it.
Anyway, my flexibility needs to be worked on, and I no longer push myself through pain to the point of injury, because recovery time takes a lot longer now. I'm 55 years old.
Foam rollers and tennis balls are my friends. So is a good massage therapist.