Hello,

There's an 8' tube in the garage and when it is switched on it takes a
long time (tens of seconds) before the light comes on.

I thought that when tubes failed they blinked several times before
lighting. With this there is no flashing just darkness, darkness,
darkness, light.

The tube and starter have been here longer than we have, so that's at
least four years.

Do I need a new tube or starter or both?

Thanks.