This is the 121st most frequent Japanese word.
年月
"Time" or "years and months."
Here, 年月 (nengetsu) refers to 'years and months' collectively, emphasizing the passage of time.
年月が過ぎるのは早いものです。
Time flies as the years go by.
In this sentence, 年月 describes the extended duration of time they shared.
彼らは長い年月を共に過ごしてきた。
They have spent many years together.
Here, 年月 signifies the influence of passing time on the building.