Also, I started getting grey when I was 19. However, I've always looked young for my age, people were still mistaking me for 18 in my mid-to-late 20s. Greying doesn't necessarily mean anything about age. But to be fair, I suppose that in art, where visual information is important to get across in character design, it often is an indicator of age.
My brain boggles at the idea that the companion LIs in Origins were in their early or mid 20s. Morrigan, Alistair, Leliana, and Zevran seemed *at least* in their late 20s to me. I always imagined the WardenPC was the youngest of the group.
Same. I started graying in my 20s, and it's really picked up in my 30s...but one of my grandmothers was completely white by my age, so, yeah, thanks genetics. I'm relying on the combo of my Mom's "stay young looking for ages" genes and a good hairdresser.
I was surprised at the idea of the companions in Origins being so young too, though I think some of it is projection. I was 32 when it came out, and I feel like the companions are ambiguous enough that way to let a lot of us simply feel like, "Oh, he/she is about my age" without too much thought. That's probably by design. Or possibly just my own coping mechanism for no longer being in my 20s. Even though a person's 30s are VIBRANT AND AWESOME. *cough*
I guess Alistair's personality is young, but I kind of just thought he was naturally awkward, charming, and leadership-averse. Depending on whether you harden him or not, he doesn't really change much once he's on the throne. It's just him, not an age thing.