rejuvenile
n.— «With academia watching and marketers salivating, rejuveniles (or kidults or adultescents) are showing that aging and growing up aren’t the same anymore.» —“‘Rejuveniles’ treasure childhood thrills” by Jamie Gumbrecht Dallas Morning News (Texas) Dec. 22, 2004. (source: Double-Tongued Dictionary)
Further reading
The admonition Don’t Mess with Texas may sound like a tough guy’s warning, but it started out as an anti-littering slogan more than 40 years ago. In the 1980s, the Texas Department of Transportation launched the campaign to cut roadside litter that...
While hiking in Colorado, Becca from Corinth, Texas, felt what she calls a kind of “pre-emptive nostalgia,” an appreciation sharpened by knowing the beauty would soon be gone. Is there a word for “feeling homesick for a place you haven’t yet left”...