"In Europe, 100 miles is a long distance. In America, 100 years is a long time."
There are two sets of answers showing up. One assumes that the device needs power (at least enough for "standby") FOR 100 years, and the other assuming that the device will be completely inactive, and only needs power AFTER 100 years.
BTW, I don't know that modern semiconductors are expected to remain operational after 100 years. Diffusion of dopants might render PN junctions non-working, and insulating gates non-insulating...