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"old" is also used as a crossword clue. If that's what you saw, the answer is often longstanding (12 letters).
Definitions
Not young; from long ago
Word origin
Inherited from Middle English old, oold, from Old English ald, eald (“old, aged, ancient, antique, primeval”), from Proto-West Germanic *ald, from Proto-Germanic *aldaz (“grown-up”), originally a participle form, from Proto-Indo-European *h₂eltós (“grown, tall, big”).
Used in a sentence
“an old abandoned building”
“an old friend”
“When asked why the devices were retrofitted on older models instead of newer ones, Sarno said the MTA typically uses older car models when making modifications in case there are any unwanted effects.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer10 curated clues
01“Advanced in years”3 letters
02“Aged”3 letters
03“Long in years”3 letters
04“Long past new”3 letters
05“Longtime”3 letters
06“Not recent”3 letters
07“Past its prime”3 letters
08“Seen many years”3 letters
09“Used for many years”3 letters
10“Not young”3 letters
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