Age bracket questions...

[Tigermoth]

Just saw someone referring to their piggies hitting “senior years” in another thread and it got me thinking. When are they considered senior? They seem to be just a few weeks when considered “teenage”, how old are they when generally thought to be through that and a settled adult? When is senior? When is proper geriatric?
Mine are probably 4/4.5ish now (true age not known) so I suppose they are well into adulthood...

 

[DMS260820]

I would say at about 6 - 7. But i dont know technicly. ( senior that is)

And i thought adult was when they reach over 15 months old. But again I'm not sure

 

[Mother Hubbard]

For me;
Mini-pigs 0-6 months
6months-1.5yrs youngsters/pre-adolsence
1.5yrs-5yrs adults
5plus - senior for me.

It would be interesting to know what people thought though.