>>417542927
Late response, but you actually don't need to mix bases but actually reshape them into older versions. Pic related is my kikyo edit. typically older = taller, smaller eyes, longer face. It doesn't have to mean curves, but it does help convey the message. Even with slim body types, there's a few new mild curves like a wider ribcage, a smaller waist, and more defined arms/legs. It's a goofy example, but https://booth-adult.booth.pm/ does edits and they're night and day to the original source, Karin being the most normal example. There are some more "mature" models like this to start with, though, that already look fit to be tall:
https://blackheart.booth.pm/
https://ande.booth.pm/items/3170874
https://booth.pm/en/items/2789739 (this artist is coming out with another mom soon)
https://booth.pm/en/items/3457543
https://booth.pm/en/items/3053320
[spoiler]please everyone get taller i hate being in for-small-people worlds[/spoiler]