Once you do start exercising though, you have to watch out to not overdo it.
I've found that as I get older, what I would've considered moderate exercise 7-10 years ago, now causes bad moods, brain fog, fatigue, general irritability for a day or two after the workout. And getting enough sleep, drinking a lot of water, and making sure to eat right doesn't seem to completely alleviate the problem completely.
It's hard striking that right balance.