How are you,How old are you是什么意思

how are you:你好嘛~?how old are you:你多大了~?不过现在流行一种比较幽默的说法：how are you:怎么是你?how old are you:怎么老是你?!因为are的意思相当于中文的“是”,old是老.所以才有这种说法~但是正确的还是你...