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The life span is 4-8 years.
They can lose hair with nutritional issues, and housing issues...if you are sure that is okay..another big one in female g.pigs is hormonal...they get cystic ovaries.
I recommend making a few calls on Monday and see if you can find a vet comfortable with G.pigs and with an in house ultrasound machine. What we usually do is use a light anesthesia gas, ultrasound and the ovaries..and if they are cystic, we recommend spaying the G.pig.
I guess before you do this, a discussion of $$ needs to happen. Most people don't hesitate with a cat or dog, but the smaller creatures don't get many procedures.
Cleaning with fresh pine shavings is good as long as the pig has always used pine. There are some grates that are smaller ...but I don't think you should change everything all of a sudden. The vitamins, you need to make sure that you are giving the recommended dose. Vitamin C degrades quickly, so if it is an old bottle, replace it. Fresh fruit does help.
I still think it most likely is ovarian, but a vet would need to look at the skin and hair loss, they can have mites and other issues that you can not see with just your eyes!