Okay, here's the question. Let's say you have 4 different men who are all 52 years old and 6 ft. tall, as follows:
1) BMI 26. Rock hard musculature.
2) BMI 26. Moderately buff.
3) BMI 24. Soft appearance.
4) BMI 24 Moderately buff.
Would my female intuition likely be correct in determining their relative "shape?" IOW, given that the statement "shape is very much more indicative of personal habits than personal genetics" is true, is my feminine intuition running a merit-based program? Unfortunately, I am inclined to believe that this is, at best, only maybe 50% the case.
Also, I dated a man who was a serious jock in his youth and into middle-age. Somewhere on the internet there is a video of a one-on-one basketball challenge he won when he was 55. When he got into his 60s, despite his continued activity, healthy eating habits (would usually feed me something like a giant plate of roasted asparagus from his garden, organic turkey burger with no bun, glass of wine) and general rule of thumb of following all advice offered by Berkeley Public Health Newsletter , he started relatively (he was standard football player size) feeling like, in his own words, " a dry leaf about to blow away" , so he started supplementing testosterone and it worked very well.
Compare the chart below with the one Jacob posted showing testosterone decline. I have asked quite a few older men in my acquaintance, exhibiting varying levels of fitness, to compare their personal preferred sexual frequency (desire to ejaculate) at age 20 to age 50, and they have almost universally reported it to be right around half. Just because hormonal decline comes on at a slow creep for men vs. the rather rapid fall at midlife women experience, doesn't meant that it doesn't happen or that it can be totally compensated for through healthy natural practices. Nature wants us to eventually die.
http://www.sexarchive.info/ECE1/older_men.html