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(one's) age
「齢」 has another reading with different meanings.
instar (developmental stage of arthropods)
齢としを重ねかさねて強くつよくなる。
One grows stronger with age.
齢としのわりに元気げんきな人ひとだ。
They're energetic for their age.
齢としを聞くきくのは失礼しつれいだと思いおもいますか。
Do you think it's rude to ask someone's age?