Leliana's not even 40, what are you complaining about with her face?
While there is no solid evidence of her actual age, she was very young when the Fereldan rebellion ended successfully: http://dragonage.wik...wiki/Leliana#.
Also, there's her banter with Wynne:
Wynne: It is sometimes so hard to believe that you have been through so much, at such a young age.
Leliana: I think I look younger than I am.
Wynne: Yes... yes, that is possible. When I was your age I was just about ready to take on my first apprentice.
Wynne: In hindsight, perhaps I should have waited a few more years. I was arrogant, my confidence bolstered by my youth.
Leliana: It is so hard to imagine, seeing you now.
Wynne: Oh, I've had some two decades or so to grow mellow. Believe me, back then I was quite... prickly.
Leliana: So you are like a fine wine, yes? Losing the raw edges over time?
Wynne: I suppose there is some truth to that analogy but dear Maker, I do hate being compared to wine. Or cheese.
Wynne: Especially cheese.
My point is, she may 30 years old during DAO and nearing 40 in DAI. Her face is probably a result of either good genes or magical plastic surgery.