noun
Refers to a calendar year or a period of twelve months. Common in expressions like 年を取る (to grow older) and 年が明ける (the new year begins).
今年は良い年になりそうだ。
This year looks like it will be a good one.
年が明けたら新しい仕事を始める。
I'll start a new job when the new year begins.
noun
age; years old
Indicates a person's age. Often used with counters or in questions about age. The kanji 歳 is common for this sense.
お年はいくつですか。
How old are you?
彼は年より若く見える。
He looks younger than his age.
noun
old age; past one's prime
Refers to being advanced in years or past one's best. Often used in set phrases like 年のせい (because of age) or 年には勝てない (you can't beat age).
年のせいか、最近疲れやすい。
Maybe it's because of age, but I get tired easily lately.
年には勝てないものだ。
You just can't beat old age.