The kanji 齢 primarily represents "age" or "years of age." It refers to the number of years someone has lived, or more generally, the duration of time that has passed. It can also imply a person's life stage or the aging process.

・On-yomi (音読み): ・レイ (rei) ・Kun-yomi (訓読み): ・よわい (yowai)

⚫︎ 年齢 (nenrei) Translation: Age ⚫︎ 高齢 (kōrei) Translation: Old age; advanced age ⚫︎ 長生きして、長齢を保つ (Nagaiki shite, chōrei o tamotsu) Translation: To live a long life and maintain longevity.

The kanji 齢 is a phono-semantic compound (形声文字, keisei moji). It combines the radical 歯 (ha, "tooth") with the phonetic component 令 (rei, which provides the sound). The tooth radical suggests the physical aspect of aging, and the phonetic component 令 provides the sound and possibly hints at the passing of time or an order (as in, a sequence of years).