I was never a partier so I don't have that to get sucked out of me. What I've had to cut back on and better manage is my time on entertainment. As much as there's the part of me that wants to sit around on the computer all day, stuff around me would fall apart and decay if I did not give a certain amount to maintenance. Being 41, I seriously reconsider how much of my social life I want to be online.
No question, time moves forward and our interests can change. Getting caught up in internet memes no longer has the same appeal. I wonder, when we are younger is it reasonable to say we live on anticipation? As we grow older, we live on contentment. This is not to say I don't anticipate new things, it's just that I don't live in that state. Having read about "addiction" to experiences, it's not the end reward that gets a person hooked but rather the lead up to it.
On a final disjointed thought, as we get older we do have a certain responsibility to step back and help the younger generations. There's no way I can compete with their innocence and energy.