I've bought many speakers 10, 20, even 30 years old. I've not had issues with any of them.
Don't know if they degraded in sound over the years, though, as I don't have a new pair to compare them to.
As long as they weren't abused and the drivers themselves look fine, I wouldn't hesitate to buy. The "abused" part you can't tell by looking at the driver. I look at the condition of the enclosure and guess that if it looks pristine, it's more than likely the previous owner(s) handled the speakers with care.
Don't know if they degraded in sound over the years, though, as I don't have a new pair to compare them to.
As long as they weren't abused and the drivers themselves look fine, I wouldn't hesitate to buy. The "abused" part you can't tell by looking at the driver. I look at the condition of the enclosure and guess that if it looks pristine, it's more than likely the previous owner(s) handled the speakers with care.