It's never too early是什么意思？

究竟是＂那不要太早＂还是＂越早越好＂？为什么？

It's never too late.是永远不会太晚的意思。
It's never too early呢？却不是永远不会太早的意思。
这是一个双重否定句。
解释为再怎么也不过分通俗点就是“再怎么...也不过分， 也就是越什么越好，怎么做都是应该的，例如
you are never too young to start doing things”任何时候开始做事都不会嫌早
A nurse is never too patient to a patient
护士对病人再多的耐心也不嫌过分

你的原句
Expert agree that it's never too early
专家认为越早越好。

那都合时宜。

it's never too early for children to start learning an instrument 词典结果 it's never too early for children to start learning an instrument 孩子们开始学乐器是不早的