Propecia and Fertility Levels

I am a 23 year old male and have recently started using Propecia. I have two questions concerning the drug. My first is whether or not it works better in younger men, since the hairloss is caught earlier (maybe easier to reverse the process). I heard that the sooner you catch the problem, the more of a chance you have of at least retaining what you have. My second question is whether or not the decreased amount of ejaculate, as a side effect, (which I have experienced to a degree) has an effect on my fertility levels. Thanks much for your time.

Propecia seems to work better on younger men, particularly those who are at the earlier stage of hair loss. The decreased amount of ejaculate may be one of the side effects of Propecia, but it has no impact in fertility levels. Furthermore, the decreased amount of ejaculate has no correlation with a decrease or increase in libido.