Short answer: probably a wise move to replace.
Long answer : I am betting the rubber component will deteriorate over time.
Tyres have a 5 year limit I believe.
The strength material will likely last forever, unless it snaps from stress.
If you cruise like on a lazy Sunday drive only, then stress will be minor, and you will likely see the belt is still in pristine condition.
It will be interesting to read your report on the condition of the CVT when you check out later.
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