Been in my house 30 years, every room has been painted once, most within a year of moving in, the people we bought our house from actually had an orange wall!

Family room and Living room painted once in 30 years
Kitchen painted twice
Master bath painted 3 times
Kids bath painted once
Guest bath painted once
Bedrooms painted once
Now, I am in the process of selling my parents house, none of the three bedrooms has been painted in the 53 years since the house was built.
Every realtor, and the inspectors who have gone through all agree, they still don't need to be painted. Gentle use I guess
I hesitate to mention....since I got flamed in another thread about this...it still has the original 53 year old wall to wall carpet, and the inspector pulled corners up during his look at the house and he says it too, is in perfect shape, clean, no infestations, good for many many more decades of use.