what’s the ()of your grandma?she looks very young!

what’s the ()of your grandma?she looks very young!

What’s the age of your grandma?She looks very young!
你祖母多大岁数了?她看起来太年轻了!

age 年龄

What's the secret of your grandma?She looks very young!
你祖母有什么秘密?她看起来很年轻!