midlifer

/ˈmɪdˌlaɪfər/
noun
  1. A person who is in midlife, typically between 40 and 60 years old.
    • The survey studied the spending habits of midlifers.
    • The club is popular among midlifers looking for new hobbies.
    • As a midlifer, she felt more confident than she did in her twenties.
Synonyms
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