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Jyutping tung4 seoi3
Pinyin tóng suì

Definitions (Wiktionary)
  1. verb
    to be the same age
    (syn.) 老庚, 同庚, 同寅, 平歲, 同龄, 𫝛岁, 𫝛歲, 老同, 同年, 平岁, 仝岁, 仝歲, 同齡
  2. noun, dated
    candidates who passed the imperial examinations in the same year
    (syn.) 同年
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他和我同岁。
    他和我同歲。
    tā hé wǒ tóng suì 。
    • We're the same age.
    • He is just my age.
    • He is as old as I.
    • He's the same age as I.
    • We're of an age.
    • He is the same age as me.
    • He's the same age as me.
    • He's exactly my age.
  2. Mandarin
    John和我的兄弟同岁。
    John和我的兄弟同歲。
    john hé wǒ de xiōng dì tóng suì 。
    • John is as old as my brother.
  3. Mandarin
    那两个小孩同岁。
    那兩個小孩同歲。
    nà liǎng gè xiǎo hái tóng suì 。
    • Those two children were the same age.