With all due respect there are many factors. The basics are these: the younger you are the less the side effect systemically and cumulatively as a)you've had less time on it as you're young, and b) the human body is far better at recovering say in its 20's versus its40's. It's also well known that men start to lose available testosterone once they get over 35 (hence sales of Viagra etc).
Anyway, the side effects are real and they will wreck your life.
Disregard my advice at your peril.
And before loads of morons come on slating me as a scaremonger I should point out I used Propecia for over 12 years and have had extensive endocrine and other tests, so I know what I'm talking about.
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