also: おとし
noun
Honorific term for someone's age, especially when referring to an elderly person. Often used in the pattern 御年〜歳.
祖父は御年九十歳になります。
My grandfather is 90 years old (honorific).
御年をお聞きしてもよろしいでしょうか。
May I ask your age? (honorific)
Compound of honorific prefix 御 (おん) and 年 (とし, 'year, age'). The reading おとし is a common contraction.