I’ve had the Fairphone 1 for more than four years now. There have been good and bad times with it but it basically still runs perfectly. The only thing in the way to a longer life time is a software update. Already now, I cannot use quite a few apps because the Fairphone version is too old. Will there be more updates? Or will a missing update mean the end of a perfectly working phone, especially that is made to last long?
Unfortunately, no. Read an official statement here:
And please continue there if you have further questions to avoid duplicate topics.
You could upgrade to 4.4 (alpha) to make at least some apps run again (for some time).
And please read this thread:
Edited, as Paula already mentioned all the relevant infos. This is just an add on.