The old saying "they don't make them like they used to" is not just nostalgia talking.
Modern electronics with smaller and more tightly packed components has presented some problems for making them long lasting. That in combination with lead free solder has it's challenges. There are plenty of technical articles around about this issues of lead free solder and very small pin pitch on integrated circuits.
So 25 years ago I would have had no hesitation saying a well looked after Tx can last for 20 years but now I would be turning over modern radios every 5 years. (The cost is so low now compared to 25 years ago.)