If it is religiously pumped out every other year from day one then it will last a lifetime.
If this is a property you are buying then you likely won't have an accurate history of its being pumped (and how often it's been pumped).
The WORST thing for any septic system is a garbage disposal.
Many systems are designed for garbage disposals; many are not. The first thing a subsequent owner does is install a garbage disposal and starts grinding away regardless of whether the system was designed for a garbage disposal or not. These actions may really limit the life of a septic system.
Been there, done that!
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