how old什么意思解释？

how old的音标：how old的英式发音音标为：[hau əuld]how old的美式发音音标为：[haʊ old]...

How old are you now?你现在多大了？How old is your son now?你儿子现在多大了？How old was the baby when it began to find his feet?这个婴儿开始走路时是几岁?...