Just was listening to some interesting stuff from various sources on test
- testosterone does not inherently increase aggression. It inherently increases whatever traits are valued for getting to the top of the hierarchy that you are in, and that tends to accentuate aggression. The researcher was saying he wanted to do an experiment of putting a monastery of Buddhist monks on T and seeing if they would start competing to out-compassion each other.
- testosterone doesn't make muscles grow, it increases your ability to recover, which means you can work out harder. Which means that if you are not working out hard enough currently to max your body's recovery abilities, testosterone is not going to help you pack on muscle (but it might have all the other bad effects).
I suspect that hormone therapy will be part of extending active life, but I think right now there's still a lot we don't know about how hormones work and interact.