I have a RasPi 3B with an aftermarket case with fan running my ADS-B setup. It also has heat sinks on the CPU, GPU, and RAM. With the fan installed, the average CPU temp was around 40°C. Unfortunately, the cheap case fan soon began making an awful racket so I removed it. Ever since then my CPU temp has been averaging around 50°C. In the graphs below, you can clearly see when the fan was removed.
Are those temps considered acceptable for decent longevity of the Pi hardware?