I think having alters is like the tip of an iceberg. Our system is too fragmented so much that when new situations arise for a part...another part for that part emerges to stay consistent to that parts role. This was very much heavily relied upon up through our young adult years...but with age comes experience and not so much anymore.

Sometimes a part from the distant past would appear for a bit like Hillbilly from my early 20’s did...made a comment about the truck he bought which we were still driving, and then went back in. With him though come flooding back long buried memories of how it was, then gone they were when he went in.

Our minds are in a condition to create an alter for facets of life spontaneously...like since childhood. I’m sure as I live longer...new ones will appear because this is how our minds adapt to new stimuli and situations. IMHO.