garage door springs

[sixto]

We have an older style garage door - single panel, two cars wide (16' ?) - that's held up by two long coil springs on each end. The springs are intact as far as I can see but they don't hold up the door with sufficient force on a breezy day. I don't recall that this was an issue in the past. Do these springs wear out from just sitting in place? Is there a maintenance schedule for the hinge mechanisms other than the note to lube the joints once a month (which I've never done)?

Thanks,
Sixto
95 S420
87 300SDL