expression, noun
approximate age
Used to indicate someone's age roughly, often when the exact age is unknown or not important. Similar to 年頃, but 年の頃 is a set phrase.
See also: 年頃
彼は年の頃四十歳くらいに見える。
He looks about forty years old.
年の頃はおいくつですか。
About how old are you?
年頃 can mean 'approximate age' as well, but it also commonly means 'marriageable age' or 'puberty', which 年の頃 does not carry.
Compound of 年 (toshi, 'year, age') + の (no, possessive particle) + 頃 (koro, 'approximate time'). Literally 'around the age of'.