That's dangerous, you're too old to be doing it!

I will be 73 in July. I have my aches and pains, mainly knees and shoulders, but for the most part I do whatever the hell I want to do. I try to hit the gym 3 days a week so I don't get too stiff. I don't do heavy weights any more; just enough to stay loose and strong. I won't let anyone tell me not to do something because I'm too old. I am smart enough to know what I can or cannot do. I can tell that it takes me all day long to do what I used to do all day long! But, I won't stop doing it; just maybe not as quickly or as long as I used to.