I'm not saying we should call him an adult all ready, but Greg stated that he met the Gems when he was 22, and it can be assumed that shortly before Greg lost contact with Marty he impregnated Vidalia with Sour Cream. Theoretically, this would make Sour Cream 22 and not a teenager, which is feasible as one of the writers confirmed that the Cool Kids were a mixed age group. But hey, for all we know Vidalia was pregnant with him four years because she's secretly a Gem and YES I am still holding onto this theory. Not Yellow Diamond, but a Gem is possible.
Oppose we don't know how old Greg is now, so we can't really say that sour cream is 22. Also he kind of looks like that stage between 18-20, where he isnt quite an adult and is not quite a teenager, so I think our safest bet is to keep it as it is.
Alright I've checked the episode and it only says Greg was 22 years old when he met the gems. There's no way of telling it has been 22 years later since it was never stated. It might as well be 18 or 26 years later if that's the case.
For that i'm going to have to Oppose this proposal.