Can't resist the spamming opportunity. So, you're looking for honest answers on a mature affiliate program that converts and makes bank? Well, I know it wasn't exactly what you're expecting but I'm going to recommend that you listen to two of my mature clients (Grammacash and OldSpunkers)... two of MANY making thousands monthly... read what they have to say at:
http://www.sintalk.com/testimonials.html or E-mail me and I'll put you in touch with a list of at least 5 clients that are making bank with their mature phone sex lines. My average mature phone sex line converts at 20-30% on gross phone calls (which is 2-3x the phone sex norm FYI). Add the revenue to your sites with a vanity number mature phone sex line and you WON'T lose any of your click traffic because you're promoting the numbers directly.
Good luck making mature moola!
Brad