(one's) age
「齢」 has another reading with different meanings.
instar (developmental stage of arthropods)
齢を重ねて強くなる。
One grows stronger with age.
齢のわりに元気な人だ。
They're energetic for their age.
齢を聞くのは失礼だと思いますか。
Do you think it's rude to ask someone's age?