Steve's age at the same rate as humans for about 20-30 years, and afterwards they age at 1% that speed. So physically, yes they're in their twenties and thirties, but actually- I'm just going to do a few, not all;
Rainbow 28,
Blue 37,
Green, 29,
ProfessorRed 74,
Purple 45,
DarkSteve 154,
Plague Steve 288,And, the moment you've all been waiting for,
Nightmare
Is
148It isn't always the same rate, either. As the stronger a steve's personal energy is, the longer they will live.
The average steve is considered an elder after a few thousand years, but steves as strong as gods, and special steves like Rainbow and Nightmare could easily live many times that amount still appearing young.
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Headcannons for Steve saga
Fanfictionand Rainbow Quest, but I consider them the same thing.