I'm not over 60, yet, and I feel there are likely many, myself included, who don't know what a "set of full squats" is, exactly.. when you recommend such things could you at least say what that is thanks?
A "set" probably refers to 5 or more repetitions per set, so 3 sets are 3*5+ repetitions of squats. A "full" squat probably means to go so low that your butt goes below your knees.
Sorry. For me a set is just going to your limit. A full squat is where your butt touches your ankles but don't "bounce" - pause momentarily before you come back up.