You’ve got to judge on dog to dog basis , Iv had dogs keen catch and hunting at 12/14 months old and dogs later , same approach out from young watching and learning they enter when there ready but my arse does start to twitch if there’s no signs interest , dogs got to show me some form of interest before 2 , we all got different standards , I know boys with dogs I’d never own and there’s probably boys that would never own my dogs it is what it is no right or wrong way about it really