I am 44...just many injuries from contact sports...some pretty horrific crashes racing bicycles...but doing good =)
As for squats I prefer not do go over that...just me...perhaps more here and there but I honestly never did them until recently...so just concerned that I can get tweaked from trying to overdue things rather then listen to my body...
I still lift fairly hard...but I hear you guys and appreciate the advice...I just recently started lifting with a new member and the dude is a beast....245lbs so I am sure he will push me beyond my safety net