You'll find out when you get old the only thing that really happens fast is getting older. If you keep your health though, you can still do all those things you love but just not as fast. This ranges from everything from sporting ventures to mind activities to bodily functions. You can still do them although not as fast and don't expect to command the same skill level. Also, be prepared for the back, neck, shoulders etc. to voice their dismay a day or so later.
The other thing about getting old is you spend a lot of time pondering your time wasting youth. In my case my mind wonders back to the very earliest of memories. It's very odd how you can recall those rather clearly but can't remember the time in the middle like anything about the fifth grade, even who your teacher was. Worse yet, where did I put the tape measure down five minutes ago?
This can be somewhat mitigated by forcing yourself to develop mindful habits. Years ago I use to lose my keys with great regularity. That never happens now because I have trained myself to put them in only one of three places.
- on the dresser.
- in my pocket.
- in the vehicle.