How to tell puberty is over for taking finasteride

I’ve read that many doctors prescribe finasteride to patients as young as 16, so my question is how do doctors safely establish that suppressing DHT in patients so young won’t be a problem?

I don’t believe that depressing DHT impacts the body significantly in men over 17 who are well past puberty. By this, I mean, growing your height has plateaued, facial hair may have started to grow.  Most boys will stop growing taller by age 16 and will usually have developed fully by 18.

We see more testosterone production with finasteride. I have had many patients over 17 on finasteride and most are fully grown. You do raise important issues that should be discussed with your doctor