Vocabulary What does 年数 (ねんすう) mean? 年数 (ねんすう) means number of years (of experience, use). Quick factsReadingねんすうPart of speechnounLevel (estimated, JLPT framework)N2 年数ねんすうN2 · estimated, JLPT frameworkCommonnumber of years (of experience, use)1noun number of yearsKanji in this word年year (unit of time)数number, quantity; count