I'm currently using a Wacom Intuos 4 that I bought around August 2009, which is over 15 years ago now, and it's still in fairly good condition (I hope it doesn't immediately develop problems after saying this XD).
As for my previous tablet, it was a Wacom Intuos 2, which only lasted about 4.5 years before it broke, so it really depends on luck.
Additionally, I previously worked briefly at a company that created illustrations for English teaching materials, and at that time I used a Wacom Intuos 3, which I personally found to be the most difficult to use. Its pressure sensitivity was terrible for me because it was too sensitive - I would apply just a little pressure and it would draw very thick lines. But if I set it to require more pressure, I had to press extremely hard to get lines that were thick enough.
In any case, I'll continue using the Intuos 4 as long as it works, and I hope it lasts for several more years.