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Jyutping mong4 nin4
Pinyin wàng nián

Definitions (Wiktionary)
  1. verb, literary
    to forget the year or age
  2. verb, literary
    to disregard age; to be indifferent to the age difference
Examples (粵典–words.hk)
  1. Cantonese
    忘年恋唔系好多人认同。
    忘年戀唔係好多人認同。
    mong4 nin4 lyun2 m4 hai6 hou2 do1 jan4 jing6 tung4
    • Age gap romance is unacceptable for many people.
  2. Cantonese
    忘年恋
    忘年戀
    mong4 nin4 lyun2
    • love between old and young people