While modern digital cameras are an amazing collection of electronics, a major component, the shutter, is mechanical and, as such, has a mean time between failures (MTBF). Camera manufacturers publish the MTBF for each of their camera models.
My Nikon D750 is 4 years old and heavily used doing real estate photography, so I was curious as to what the shutter count is and how close to the 150,000 MTBF Nikon specifies for the D750. As it turns out, the shutter count is included in the meta data stored in JPEG files. To easily determine the count, you simply upload an unedited JPEG file to, https://www.camerashuttercount.com
I discovered the my 4 year old camera is not old, but merely middle age. 🙂