As the age changes, so does the fad to exercise. Yesterday it might have been yoga, today it's power yoga. Fads come and go, but basics stay. And the one which has endured over the centuries is one's ability to do push-ups, variably called as dips.
I just found a push-up calculator, which determines your body fitness according to the number of push-ups you can do. Oh, and women can also measure their push-up strengths there.