That is something I do worry about as I get older. I'm a big Do-It-Yourself'er. It saves money, is faster, and I really enjoy it. There are very few things I can't do myself. But even at 57 I can tell things are getting harder than they used to be. I'll keep doing what I can as long as I can, but at some point I imagine I will reach my limits. That will be a very sad day indeed. Not only will I have price sticker shock having to pay someone else, but I'll be giving up a big part of who I am. I'm sure I'll also be a perfectionist, frustrated with hired help that doesn't put as much time and effort into a project as I would. I'm very detail oriented, hired help tends to get in and out as quickly as possible.
Except that I'm 66, this is exactly how I feel about it! I draw the line at electrical - I won't touch anything electrical beyond rewiring a lamp, and also we hire out anything to do with the well and septic system except for "grunt work" such as digging out the dirt for the leach lines. But the time is coming...sigh...