In my world it is certainly not uncommon to work with very old technology. It takes between 12 to 8 years to develop a scientific satellite. So in the design phase you choose the most modern technology, which is however at least 8 years old when you launch the spacecraft. It is hardly possible to introduce more modern technology during the proces as all parts and the assembly needs to be qualified and when you change one part you have to start the whole proces again for the integrated systems.
It took the scientific satellite Rosetta, with its small lander Philea, more than 10 years to reach the comet 67P/Churyumov-Gerasimenko.
So the technology on board was already at least 20 years old. (Ouch there goes the myth that space technology is the modt modern technology....)