Fridge Seal Lifespan??

Hi All

I had to turn up our fridge at home to make things colder - a bit of warm weather and constant opening was making things warm

While I was about it I cleaned the radiator and the seals, but was wondering how you can tell if the seals need to be replaced or not?

The seals seem to be ok and hold well, but the fridge is about 15 years old and I was wondering if they should be replaced at a certain age? There are no cracks in them and the magnets seem to be doing a good job in most areas, but should they be replaced? Be nice to know what people do generally.

I suppose you could apply this to Engels and alike, for older and harder fridge seals.

Thanks