toygirln.
/ˈtɔɪɡəːl/, U.S. /ˈtɔɪˌɡərl/ colloquial (frequently somewhat depreciative).
A woman who is much younger than her sexual or romantic partner; esp. a young, attractive woman who has a wealthy, older partner or lover. Cf. toyboy n.
ΘΚΠ
the mind > emotion > love > love affair > [noun] > female friend of middle-aged man
petite amie1896
toygirl1988
1988 Advertiser (Adelaide) 19 Jan. 29/1 Who says love can't jump the generation gap? That time-distance can make the heart grow fonder and life richer. Just ask a few of the ‘toygirls’ and the older men they adore.
2006 Sunday Times 8 Jan. (Style section) 22/2 Another film, Shopgirl, focuses on the older-man, younger-woman..thing: he (Steve Martin) is the sugar daddy, she (Claire Danes) the toy girl.
2018 @SiniMannerVoice 15 Feb. in twitter.com (accessed 18 Aug. 2020) She's come out at the age of 91. She has a toygirl 20yrs her junior. Good on her!
This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022).
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n.1988