nelikymppinen
neljäkymmentäluku, nelikymmenluku
(monikko) en|forty
The decade of the 1840s, 1940s, etc.
(syn)
(ux)
The decade of one's life from age 40 through age 49.
{{quote-journal
The range between 40 and 49.
From or evoking the 41st through 50th years of a century (chiefly the 1940s).
(quote-book)