Louis CK is another comedian that's feeling old. At 18 you can vote, at 21 you can drink, at 47 you can just keep doing whatever - no one cares.
At this point in his life he's given up the idea of being in shape and it's a great relief not to have to come up with justification for skipping the gym.
There are advantages to being middle-aged, for example you get to reallocate some of the noises that you make for bodily functions and no one cares.