Well, one of his mates is very cute but I don't think he wants to move in with me.

Not *this* type of change :P

Is there an official age range for people?

The reason I ask is that my increase letter mentioned an increase in premiums with age categories, but I was unable to look up these categories except for the special case of kids to 18 and young adults to age 26.

My mother-in-law says she pays 1300/month for two, so I'm wondering where the age ranges are.

I believe that supplemental insurance carries with it increases based upon age categories.

The compulsory insurance rates are the same from 26 to infinity, afaik.

I think there are 3 categories:
- from birth to 18 years
- from 19 years to 26 years
- from 26 years to eternity

FAQs for Visana, https://www.visana.ch/de/privatkunden/services/FAQ.html

Swiss law on obligatory health insurance, https://www.admin.ch/opc/de/classified-compilation/19940073/index.html

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