Vocab Question

If you want the same kind of coordinating construction, like old-new, it would be

> neogeriatric

>>9299597
aage?

>>9300048
PS.

Not 'acting your age' would be something like

> diselikia

Depending on how you want to Anglicise the Greek ending; it could be 'diseliky'.

>>9299597
>what do you call it when you cannot reliably determine a person's age
Ageless? Not in the sense of "enduring eternally" but literally "without age."

>when someone acts like an age different than their own?
Depends on what age they actually are. If they're a kid, they would be precocious, if an adult, juvenile.

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>>9300050

>>9299597
"Neotenous" means retaining juvenile features. Not exactly what you're looking for but might be helpful

zipperface