Do young men respond to finasteride better than older men?

I remember you saying that younger men tend to respond to finasteride well. Is that true? If so, how?

Yes, that is true:  When hair is recently lost, reducing the impact of DHT which suppress hair growth can be block by this drug in younger men. The longer the hairs are either miniaturized or have disappeared from your scalp, the harder it is to bring it back.