How old are Smurf toys?

I'm curious about the age of Smurf toys. Can you tell me when they first came out and how long they've been popular for? I've seen them around for as long as I can remember, but I'm not sure if they're a recent phenomenon or if they've been around for decades. I'd also like to know if there have been any notable changes or updates to the toys over time. As a collector or fan of Smurfs, I'm always interested in learning more about the history and evolution of the franchise.