Closing in on 55. I'm not sure I so much feel old as not feeling young.
I am slowing down. I commented to my wife after a recent 10 mile run that I'm just not the man I once was. I can no longer go out for a four hour run like I could at 40. Now a mile and a half swim is long, rather than 6 miles in my 20s. I can no longer rock climb or backpack multiple days in a row. She kindly did not agree and said it was just because I don't have time to train like I used to. She lied. Slowing down in many ways for sure. Don't heal as fast either. So I can tell I am on a down hill slope. Fortunately for now the slope is gentle.
Having 11 year old twin boys to take hiking (went backpacking this past weekend, their first full on winter hiking, complete with ice, crampons and below zero weather!) and otherwise run around with and after helps a lot I think. Who has time to be old?
The thing really that occasionally makes me feel old, before returning to my normal self is when family members or friends my age die. That kind of knocks me for a loop. Slowing I can deal with. Full stop not so much.
When I hop onto the kitchen counter to get something from the top shelf I now think, "I need to be careful, I can't let myself fall." That kind of thought was never a companion before.
Yes. When actually young and skiing if you did not have at least one epic crash you weren't skiing hard enough. Now the imperative is: Don't crash!