How long do tanks usually last?

Hello. New guy here.

My house is 16 years old and we just put in our third water heater (out of necessity). This got me to wondering how long my well tank is supposed to last. It is a Well Tron. The plumber who was here to install the water heater said that the well tank had a bladder in it. Don't how he could tell by looking at it, but for now I'll take his word. Do you folks have any idea how many years I can expect from this tank? I am of a mind to replace it before it goes bad, but I'm not looking to waste money unnecessarily. Luckily we were home when the water heater let go.

Any information or recommendations will be appreciated.

A captive air bladder precharged pressure tank looks different than a galvanized tank so you can tell by looking.

Other than big box store brand tanks, most will last 15-20+ years IF you keep the correct air pressure in them.