What is the average lifespan of a water heater?

I just realized my parent's RUUD electric water heater is over 30 years old and works perfectly. How is that even possible? Should I preemptively replace it, or keep going with it?

Ruud Guardian Water Heater for Sale in North Prince George, VA - OfferUp

Replacing hot water heater- do I need this regulator looking thing on the new unit? If it makes a difference I'm going from gas to heat pump (high efficiency) : r/Plumbing

HOT ! Water Heaters - Ruud-MEA

※yadarchitects.com Limited model
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57.99USD

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Estimated delivery time:

Due to a lack of stock in stores, we will be ordering the item.

Delivery is scheduled for around 2026-07-26. .

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Estimated delivery time:

Delivery is scheduled for around 2026-07-31..

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*It may take some time for the product to be delivered on November Friday, or public holidays, and depending on stock availability.

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What is the average lifespan of a water heater?,Commercial Gas Water Heaters - Ruud-MEA,I just realized my parent's RUUD electric water heater is over 30 years old and works perfectly. How is that even possible? Should I preemptively replace it, or keep going with it?,Ruud Guardian Water Heater for Sale in North Prince George, VA - OfferUp,Replacing hot water heater- do I need this regulator looking thing on the new unit? If it makes a difference I'm going from gas to heat pump (high efficiency) : r/Plumbing