5 years for the waterproof turbo glider raspberry crush
The older stuff I have bought with my wife were hard and plastic, or they smelled like rubber, or the wires broke and would give an electrical shock, so to the trsh they went. I bought a LELO almost two years ago. The rechargeable battery doesn't last very long anymore. it will find the trash can home soon.
The oldest ones that I still have are 3 years old. There are earlier ones that are still working (to my knowledge) but my ex kept him. The amazing thing is that one of the 3 year old toys is a simple, cheap plastic vibe that came as part of a free gift with a purchase, and I use that more than just about anything in my toybox.