No depression for me, it is just the reality of how things are. I often catch myself wondering wtf happened, I was just a kid not too long ago.
Some of the rewards help offset the issues of aging, like knowing I only have one more year to work after 50 years of working for the man. Then it is going to be my time, all the time. Well, when the Mrs. says it's ok it will be.
Probably the most irritating issue is how much more difficult it gets to keep the weight off the older you get. When I was 38 I dropped 20 in a couple months without a problem, in an effort to get my drag race weight down. Now, I have been trying to drop 20 for 6 years now, and it is a losing battle. Walk 3 miles every morning and ride my bicycle to work, not helping. Became a gym rat, and have torn a few muscles, but haven't lost the weight.