多大英语怎么写

有以下几种情况：

1.几岁用数字+year old

例如：给三岁的孩子买这么贵的鞋真是太蠢了。

It's stupid to buy expensive shoes for a 3 year old.

2.问年龄：用age

例如：what's your age?

3.表达年的意思用year

例如：你多大了？比你大一岁.

How old are you? A year older than you.