A 2-yr-old showed signs of puberty after exposure to his dad's testosterone gel
insider.com
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I'm in my mid 30s, healthy but a bit lower than avg. testosterone. Experimented with these gels a bit, self-medicated since no endocrinologist would recommend it as a booster as there were no evident issues.
The first couple of days I (and the gf) noticed a boost in aggressive energy but then it quickly faded. Did bloodwork before and three weeks after starting, free and total testosterone went up but the difference was very slight; I've gotten higher levels in previous measurements during summertime while doing more exercise (daily dose was low, one pump from the dispenser rubbed on the shoulders)
Could try an aromatase inhibitor, just don't want to go greater lengths with these experiments, as in anabolics, pellets or injectables, with all the risks that they carry, just something that I can purchase off a pharmacy or supplement store.
Hormones are complicated.