Having the same birth year or age; belonging to the same year (i.e., being the same age).
彼女は私と同じ年です。
She is the same age as me.
大学で同じ年に入学した友達と再会した。
I met up with a friend who entered university the same year.
二人は同じ年に生まれた。
The two were born in the same year.