ZWExton Thats a typical “it depends” answer, but 10 years is a good run for them. Most companies warranty for 5 years for good reason. If you have good water it’s much less of an issue. Generally the tanks fail at the seams due to rust or they burn through if their is too much debris left in the bottom, it makes it harder for the heat to transfer so it’s fire vs metal, over the long run, that’s a recipe for failure.
If you like to run the risk, make sure your pan is good and the hose flows water, keep an eye on it and you will probably be ok for a few more years. If it were mine, I’d just bite the bullet now and replace it. It’s a $4-500 item, not worth the risk to me.