Victor [I]is[/I] a relatively new Hunter, yes, but then so are most Hunters in Yharnam; in fact I'd say a majority are even newer than Victor, as the church has been trying to replenish their Hunters from losses not only to the scourge of beasts, but also to other factions, who kill or convert their Hunters.
Even the ones counted as the absolute elite, like Dietrich and Moira, have only been Hunters for about four years; remember, nearly all the Hunters of Yharnam were killed during the Night of the Blood Moon. Hunters like Raine from before then are extremely rare.