I'd buy that content in a heartbeat.
To me - mature is over 40 -
MILFs are just the inbetween teens and matures
Grannies are my absolute favorite -
www.torrie.com - this is an EXTREMELY popular site -
Ask her if she really wants to be all over the internet though before she does it - truly explain all the ramifications of what that means - and then see if she wants to do it long term - nothing worse than starting a 'personal' site and then having the feature duck out on you after finding out how 'famous' they may become.
Then - if she really wants to do it - pm me and i'll tell you what my surfers request more often than not.
I may not have the biggest mature sites on the net - but i'm running one of the oldest ones - several that started before me in '97 are gone now.
btw - Torrie only poses solo - I'll tell you why that's a PLUS - in private