(Oh, I should probably answer the question Katie asked me here too for future readers. I was talking to Katie about something else and had just replied there.)
My GP gave me a scrip for finasteride no questions asked. (Proscar, not propecia or generic propecia dosage finast. Proscar is cheaper while being higher amount of finast, which you then just divide so is even cheaper still!) I had a lot of the light, pigment-less growth from minox alone, which is what drove me to rush and get the finast. I'm 35 and most hair loss was well with in the oft cited 2-7 year window, with the added caveat that not all of it was due to androgen issues. My mother passed along somewhat thin hair on top, and also I had a lot of damage from psoriasis, that was seemingly easier to repair than traditional male hair loss may be. (Damaged follicle versus destroyed follicle I suppose.) I've had very positive and quick results all things considered (though won't get full coverage by any means), but I can't attest that will be the case for most people and I have no way to differentiate between my reasons for hair loss to know if it is the hair lost to DHT that is even responding.