Wiktionary
fiftysomething
alt. (context countable colloquial English) A person aged between 50 and 59 years. n. (context countable colloquial English) A person aged between 50 and 59 years. num. Between fifty and sixty.
Usage examples of "fiftysomething".
A lean-faced fiftysomething who might be wearing a beard or might not?
She said that it's a characteristic of where we are right now on computer technology's ease-of-use curve that fiftysomethings are a bit slow at accepting technology.
I tried to tell him what Karla had told me, about fiftysomethings now just entering the ease-of-use curve with new technologies, but he wouldn't listen.