When I was a kid, my dad gave me his down bag b/c I didn't have the money to buy one. It had been compressed in its little aqua green stuff sack since the early seventies--about ten or fifteen years. I cleaned it and aired it out.
I still use it as a back up occasionally.
I used his thermarest until it finally died the weekend before last . Stuff has a lot longer life span than we think it does...