"Human older versions of the CMC along with older pony versions as well perhaps?"
well, this isn't everything that asked for, but if you want, just take their hair and stick it on a pony. boom. older CMC.
also, i didn't draw them with a cutie mark because, well, as of now they don't really have one. i assume Sweetie Belle would have one tied to music, Applebloom to, duh, apples, and Scootaloo with something to do with athletics. but that's just me.