If I could go back in time knowing what I know now I wouldn't have touched AAS until I was at least in my late 20s. Of course back then there weren't these boards and there wasn't the wealth of knowledge and experience we have today. Shit, there wasn't even an Internet back then. Where am I going with this?
Well, blood levels of many different hormones peak during our teens and 20s, then decline throughout the rest of our life. Hormone deficiencies occur later in life, which contributes to male menopause. That's why there's TRT/HRT for men.
By using AAS in your early 20s all you're doing is accelerating that process. Instead of male menopause beginning between ages 40 and 55 you're setting the stage for it to occur in your 30s. Why? Unless your aspirations are to be a Pro BBer or compete professionally in the sport why mess with your hormone levels when you're natural testosterone levels are near their peak?