I'm in my 60s and each decade has meant I had to do more to get less effect. Evolutionary biology ceased to be our friend when food became plentiful and ever more refined. If I ate what I eat now, and exercised at the level I have for almost thirty years, when I was say 25, they would have had to put me in hospital for anorexia (a term not in use when I was 25). I also think women have far more variability in our metabolisms than we generally appreciate. Some women get away with a diet that would make me weight 400lbs in short order. It's not fair, but it is what it is.
This time, like all times, is a very good one, if we but know what to do with it. Ralph Waldo Emerson
Any given day you are surrounded by 10,000 idiots. Lao Tsu, founder of Taoism