Replace glass gasket?

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When you see any signs of air leaking there or the gasket has become hard and brittle. I probably do mine every other year or so.
 
What are the signs of air leaking?

The gasket isn’t hard or brittle. I don’t think we’ve ever changed it, and we are on our 6th winter with this stove.
Glass dirty near one edge of the glass or stove harder to control due to excess air being pulled into the firebox. You can also test with a cigarette lighter or other flame slowly moved around the glass edges when the stove is operating. If there's a leak you should see the flame get pulled in toward the stove.

Personally I would change it after 6 seasons but your call.