I think the only thing that makes Brenda old in this photo is the lipstick color. Having a garnet/wine looking color on someone with porcelain skin and red hair like Brenda gives her a matronly vibe. If a moderately saturated pink was on her lips she'd look younger.
DAO, you're right! I think Brenda (+ Ren) have the most modelesque faces, just because they're different. All the other bitches look like former participants.
I think she looks gorgeous, she just needs some eyebrows fasho... I think that's what makes her look old/dated... old holly wood actress thin bitchy brows...