i Register
In some senses, fiftysomething is marked as colloquial. Watch for register when choosing this word.
fiftysomething
num 1noun 1
Definitions
num
1
An indeterminate value between 50 (inclusive) and 60 (exclusive).
noun
1
A person between 50 and 59 years old.
She was a sprightly fiftysomething.
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