When does this go bad

A handy person from Owings, MD says:
Just curious. Doing a remodel and replacing some stuff on the windows (tilt latch, shoe, weatherstripping). I notice each window has about 150" of 3/16 wool pile. It appears to be in good condition (clean, intact and not matted).
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Dave Sr. from SWISCO responded:
Unless you're feeling a draft coming through your windows I don't see any reason to replace the weatherstripping.
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