I wonder, how so called Patreon even know, what age of this damned ponies? And what age of ponies something to do with the age of humanoid's?
I doubt Patreon staff know, but:
1. MLP characters have specific designs based on their age.
2. Kids have completely different models than the adults.
3. MLP horses mature the same speed as people do, apparently. (No clue about lifespans though.)
Also, probably related, but Patreon doesn't like "bestiality" and/or bestiality, and the MLP ponies are a bit of a gray area because the rule for bestiality is pretty much focused on "REAL" animals, but the MLP horses are multicolored, can talk, and can optionally have wings or horns. I mean, they're based on those miniature horses pretty much to-scale, but yeah, gray area.
we don't officialy know but usualy fandom set the mains characters (and other ponies with same body shape) between 18-25 years old, (they are all working and live alone so they are all adult).
I mean we know RD's official age for real (21, though we don't know if they're all properly aging as the show goes on, so it could vary based on season) and we know she's probably the youngest of the main cast based on her design during the rainboom flashback (could've just been a runt though, I guess).
FS is probably the oldest if we go by that flashback, and she's got a younger brother who flunked out of college, though we don't know how much older she'd be compared to the rest of the team other than her being 1 year older than PP and everyone's general designs in the flashback not varying that much.
Faust said something like she wanted the cast to be late teens - early 20s, so it fits.
I know I'm just kinda re-stating what you've said, but I wanted to test my memory of the show.