何年 (なんねん, nannen) Japanese meaning: how many years

Meanings

1

how many years; how long

Asks about the length of time measured in years. Often used with verbs of living, studying, working, continuing, or elapsed time.

2

what year

Asks for a specific calendar year, school year, fiscal year, or year in a timeline, rather than a duration.

何なん年ねんも〈動どう詞し〉to do something for many years (continuously)
彼かれは何なん年ねんも同おなじ会かい社しゃで働はたらいている。
He has been working at the same company for many years.
何なん年ねんに〈事こと〉in what year did 〈event〉 happen
その事じ件けんは何なん年ねんに起おきたか覚おぼえていますか。
Do you remember what year that incident happened in?
〈場ば所しょ〉に何なん年ねん住すんでいますかhow many years have you lived in 〈place〉
東とう京きょうに何なん年ねん住すんでいますか。
How many years have you lived in Tokyo?
何なん年ねん生うまれですかwhat year were you born in
失しつ礼れいですが、何なん年ねん生うまれですか。
May I ask, what year were you born in?