This lightbulb is 105 years old and has been burning continuously since 1901! From the website:

# Installed: First installed at the fire department hose cart house in 1901. Then moved to fire station at First and McLeod, then to its present site in 1976 at the fire station, 4550 East Ave., Livermore, California

# Vital Statistics: Made by the Shelby Electric Company, a handblown bulb with carbon filament. Approximate wattage-4 watts. Left burning continuously in firehouse as a nightlight over the fire trucks.

Link (via Metafilter)