I would say 30 years would be the average life of a tank. If designed and installed properly they could last much longer, but most have problems that develop over time.
I just replaced both of my 32 year old stainless tanks. They corroded from the bottom due to being mounted directly on to a flat surface without breathing space between tank & deck. One started to weep diesel slowly; the other started after I cleaned it.
If their is any chance of water getting under, or on top of your tank and sitting there for an extended period of time they will definitely corrode. Also if water sits inside a tank for an extended period it will corrode.
Have a look at the design (outlet height, water drain point, slope) to see how the tank is designed and this may give an indication of life expectancy.
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