My son only really started enjoying meat in the last year. He’ll be 6 at the end of this month. He was getting all of his nutrients so I finally convinced myself to stop worrying ~4 years of age. He’ll put most kids under the table on veggies, though, which I’d much rather see than another hot dog or nugget. After my un-scientific study of one child I figure they’ll eat what they want when they get hungry and our job is to provide good choices.