You are a youngen' at 45, I got 6 years on you bucko!
You know, Boss, there is a "personal science" involved in what a person will tolerate and what they will not tolerate within their lifestyle when it concerns adding in diet and fitness, and for a long time, you have had this down pat.
Likewise, I firmly believe in the "personal and individual science" of tracking calories and weight training data and governing this calorie intake and weight training data while watching bodily feedback; and, being able to use the tracking data correctly to manipulate your calorie intake v activity ratio to a personal goal benefit.The science is learning yourself within the data and tweaking this to one's goal advantage.
It seems by your post, and years of previous history, you have this down pat too, boss.
This is why YOU WILL FEEL THE THUNDER under your feet when you walk. Its your heart vibrating with emotional ties to your personal well-being and time under the bar.
You keep on creating the lightening and thunder....Steve....