Age When DHT Stops Attacking Follicles

[Qneedhair]

Hair experts, is there an age in a mans life when the body reduces the production of DHT? My rational is if you use drugs to prevent hair loss such as Fin and Minoxidil to prevent hair loss until a certain age, then your hair will less likely fall out later in life? I was told that if you aren't bald by late forties you might be safe. Comments?