What does '来' means when it is used to describe age? For example:  someone who is '二十来岁'

Does it mean:


Someone in his twenties (20-29)
Someone in his early twenties (20-23 or 25)
Someone who is about twenty years old (might be 19, 20, 21 etc.)


(sorry for not putting any research, can't find any)
Base on the two different answers from user6065 and steveLangsford, my conclusion is, "the dictionary definition of 来 really should be a '概数' (approximate number) synonym to '上下' or '左右'. Which mean 二十來岁 = 二十岁左右 (approximately twenty)

But in practice, most people see 来 as a synonym of 几 and eventually became accepted fact that "二十来岁" means "二十几岁 (twenty something)"