Lots of good posts and useful information on this thread.
Let me add the perspective of someone in the 60+ age bracket. As you get older it gets harder to keep the extra pounds off, particularly in your gut area. I’m big on the intermittent fasting approach; I generally do one meal a day with lots of liquids during the rest of the day. I drink diluted unsweetened cranberry juice. 5-6 glasses per day.
For exercise I do abs 4-5 times per week and weights 3 times per week. I don’t do as much cardio as I should, but do get in 10,000 steps per day.
I concur with others who point to the importance of adequate sleep. My challenge is that I travel quite a bit for business, mainly back and forth between Asia and the U.S. which leaves me in an almost constant state of jet lag. I’ve figured out a way to manage it (combination of drugs during the first couple of nights and being strategic about how much I sleep on the transpacific flights).
Fortunately junior still works without need for any pharmaceutical assistance but I tend to limit myself to shorter sessions as multiple pops aren’t always in the cards.
A lengthy way of saying to you youngins that it is indeed important to take good care of your body and even more so as you get older, particularly if you want to be able to continue to perform and to enjoy sex in your later years.