It's never too old to learn. 谁能帮我译一下啊,谢谢!

it 在这里算什么意思? It's old 是什么意思?

学习从来不会晚
可以翻译成,活到老,学到老

活到老学到老。

学习永远不嫌老 （活到老，学到老）

这是英文中一句谚语.本意是；学习永远不会晚。 意译为活到老学到老。

什么时候开始学习都不晚(学习不受年龄限制）

Wrong sentence. You can say, One is never too old to learn or, It's never too late to learn. But you cannot say, It's never too old to learn. Otherwise, what's the meaning of "it" here? A dog?