It makes more sense to Belmont warriors to be 25 - 35 years of age than 19 years guys. To battle the prince of darkness more a more experienced warrior is needed :p
I think age is irrelevant, Buffy was much younger, and people accepted her as a vampire slayer. Who's to say Julius didn't enter a strict regiment of training since he was a child?
As for my opinion on Victor, I like the fact they are bringing back an aborted Belmont. Victor is one of those names that is perfect for a hero in the CV series. I DO see the Assassin's Creed likeness, though. Actually, he's kinda(at least to me) a cross between Ezio and Dominic Santiago. Oddly enough, this isn't a gripe. I don't mind his look.
I don't care for his armor, though. Funny who people were ragging on Julius for looking "un-modern" with his 19th century fashion, Victor's gone MEDIEVAL!!! He looks like a homeless knight. Though, the true reason I rag on his costume is that it reminds me what I dislike about a LOT of Japanese art direction in games(Tetsuya Nomura comes to mind), the whole lopsided balance in design. The gauntlet on one are and the other arm being close to bare reminds me a lot of characters like Tidus, or even Advent Children Cloud. Urgh, it's just my preference, but I can't stand imbalance in design. Maybe once in a while, but when it becomes "en vogue", so to speak, urgh!