I used to be able to work out more than I can now. Part of it is due to scheduling, part of it is due to age.
I used to be able to eat whatever I wanted as long as I exercised. But now, sometimes even if I do exercise regularly, it is not enough. I am reaching a point where I may have to make some serious changes to my diet. Like giving up chocolate. Cutting out junk food will require some serious mental discipline.
I used to work out to make my whole body bigger. Now I work out to make my stomach smaller, and that is a lot more difficult.
Perhaps there is a limit to what exercise can do. Working out more as I get older is not as hard as I thought it would be. Eating less, on the other hand, is proving to be a lot more difficult than I thought.