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Life expectancy about 75 - 79 years. It is no different for people with IIH. There are however complicating factors, such as if you are shunted, you can be more prone to infections, that can cause life threatening diseases such as meningitis. If papilledema is not treated or you present with treatment resistant papilledema, you are at risk of vision loss.
Research has shown that weight loss can contribute to the decline of symptoms and would be beneficial for your whole health. Optic nerve sheath decompression and fenestration and shunting has proofed to be successful but not perfect. Gastric bypass surgery can also assist overweight patients.