Hasselblads in the hands of professionals doing 100K exposures a year will need very frequent servicing. But it's not uncommon for a camera that gets regular use to work for 20 years or more before it gets it's first service. These are 2 extremes and most likely your camera would need new lightraps and mirror cushions, not expensive. Check the shutter speeds and put a film through it, have fun. I know people who still use 40 year old cameras with digital backs professionally.