Ah, we collect badges here yeah? Bought mine in april 2016, so I guess my Fairphone is now also 3-and-a-bit years old. Modifications:
Replaced the bottom module 3 times as the microphone kept breaking. The current bottom module lasted over a year,
Replaced the battery roughly every year, as stability becomes a huge issue as the battery wears with multiple reboots a day before the 19.11.02 OS update,
Replaced the case three times, two malfunctioning flex-cases, and one malfunctioning hard-shell case (cracks in the bottom corners).
Not perfect, and I can tell the screen is getting quite bad (coloured stains in several areas) but it’s still running absolutely fine and better with every software update!
Here is another 3y happy user. I got mine before X-mas 2016. Running Fairphone Open ever since.
I am very happy with it, the battery gets a bit weak now but it still lasts 1 day with little usage and even more when kept for just being called.
Changes up to now: the back case. The first had the known issue that it bent at the buttons but I had decided to buy the transparent case because of its great design anyway. The moment I had it in my hands I realized it would not last long, too hard and brittle plastics and I got a free replacement much later-on, when it started to break into pieces. The new cover is in blue.
I am still using the 1st camera. For doing really nice pictures, I have a separate camera.
My intention is to keep it at least until its 5th birthday, so another 2 years to go. There are now first pure Linux phones in development, that would be a great solution for privacy. By then, hopefully these solutions will be mature and even more hopefully they will also provide fair devices.