Depends on the player Ronaldo was 18 when he made his debut by 19 he was a regular at united and hasn't really struggled with any injuries throughout his career. Owen is well know to have been the worst trainer and didnt look after himself very well as didnt Mellor. Even though hes had injuries I think maybe like Gerrard they maybe growth related so let's see what next season brings.
Looking after themselves is part of the nurturing process though, or should be.
Eating properly, getting enough rest, training properly all contribute to a players longevity.
Back then, the club didn't pay much attention to that side of things.
I read recently that after joining utd, a couple of the first things Ronaldo did were to hire a personal trainer/advisor and a nutritionist and chef/cook.
It can help immensely.
I'm sure the club has moved on now, and understands the importance of things other than football training to increase longevity and minimise injury risks.
It's really the same with all young players; wait and see.
But if Klopp thinks he's ready, then I'll go with that.
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