Well, I'm 65. I didn't realize it until my kids reminded me. Sometimes they might forget when they ask for help doing things like digging post holes to put in a fence.
Last year I ended up getting an inflatable life vest so they wouldn't worry about me going out in cold spring water. I think it's a good idea actually so I always put it on especially if I'm out alone. But, to them, it's like having one of those life alert buttons in case "I've fallen down and I can't get up" as in the tv commercial.
In the last five years I've noticed some strength decrease even though I work out trying to compensate for it every other day. My balance is sometimes a bit off, especially in the mornings right when I get up, And the integrity of the knees, particularly on stairs is beginning to be felt. I tell my doctor, "What's going on? This getting older thing is for the birds."
I am fascinated by the aging process. It's like your body begins changing slowly and all you can do is be inside it and experience it happening. Sometimes you notice it and think 'What's going on?' The change isn't like puberty but it is as noticeable. You can see the subtle changes that you have absolutely no control over and it makes you wonder... well, if that happened in the last five years, what will it be in the next five, or five after that? I'm trying to ignore it.
I believe it's good to age gracefully as it's inevitable. But, I'm also resisting it by refusing to act older. Alas... it doesn't always work.