This is the 4943rd most frequent Catalan word.
vells
"Vells" means "old people" or "old/aged" in English.
In this sentence, 'vells' is used as an adjective describing the noun 'llibres' (books), indicating that they are old or aged.
Els llibres vells tenen un encant especial.
Old books have a special charm.
Here, 'vells' is functioning as a noun referring to elderly people, often used to denote elders within a community.
Els vells del poble es reuneixen cada tarda a la plaça.
The elders of the village meet every afternoon at the square.
In this context, 'vells' modifies 'temps' (times), indicating that these times were in the past or long ago.