Why would Morpheus8 results only last 1 to 3 years?

I do not understand results lasting typically 12 to 18 months. To erase most of those results that fast does not sound like 'normal aging.' I'd be rather mortified if the reverse of those results I'm seeing from this device happened to me or someone in just a year from aging. Explain why the benefit from the controlled damage would only last so short a time? Even 3 years makes me hesitant that it temp helps, does harm long-term. My skin doesn't age much so far in even 10 year blocks.