How do steroids at a young age really effect hormones later in life?

[Shsm]

I was talking to this man at my gym earlier today. He's huge, so I asked him what his thoughts were on younger individuals using steroids . He says he's been cycling ever since 17, each cycle after heavy research to ensure he carried the cycle, AI, and PCT protocols perfectly and abides by the "Time on=Time off rule. He said his blood work dictates he's recovered completely each time and is a perfectly healthy individual.

My question is, provided you cycle correctly and recover perfectly each time, how do steroids at a young age really effect hormones later in life?

I don't intend to piss anyone off with this thread. Just wanted your view on it