My colleague Dr. Robert Bernstein states: “As you suggest, it would be reasonable to assume that since DHT stimulates beard growth, blocking DHT (with finasteride) would tend to inhibit its growth. In practice, this does not seem to be the case, i.e. we don’t find that Propecia has any effect on facial hair. The reason is not clear.”
I have not seen this complaint in young men either, just as stated by Dr. Bernstein.