It depends entirely on who you compare yourself with. Can you keep up with a healthy 17 year old who has been athletic all his or her life? Probably not.
Can you keep up with most other 33 year olds? Quite possibly.
I work in the fire service and have to constantly remind myself to keep a lid on those comparisons. Every few months we get a new batch of probies (first years, fresh out of the academy), and they are so eager, and gung ho, and in shape, and excited to wake up in the middle of the night because they might get to go to a fire. When I compare my self to them, I feel like an oldtimer, many (not all) of whom are overweight, tired, battling high blood pressure and heart disease, couldn’t care less about ever seeing another fire (I’m not really quite there yet).
And when I compare myself to regular citizens my age, women who are not in a physical job, I usually feel strong, confident and competent.
Which goes to prove again: it’s all in your mind. You can do anything you want, except BE young and uninjured (can’t turn the clock back). But you can feel young again, and confident in your body.
Sorry about the soapbox, I think I was trying to get myself motivated to go run some stairs today…