The light switch for our attic turns on a single ceramic socket at the top of the stairs. The bulb burned out a few days ago:
To the best of my knowledge, that bulb has been in service since we moved in almost two decades ago. Most likely, it was installed when the house was built in 1955, because it matches several new-old-stock bulbs in a battered box that Came With The House™.
To be fair, the attic light doesn’t see much service, but … it’s been a great cost-performer!
The attic temperatures range from well below 0 °F in the winter to well above 120 °F in the summer, so it’s no place for CFL or LED bulbs. I swapped in a 60 W bulb from my heap, although I doubt it’ll be good for another half-century.
The Smell of Molten Projects in the Morning 