Can LED lights run for 25 years? 10 years?

Some people are working on circuits to make a dim LED light run for a year, or even 25 years. The initial attempts are to provide "marker lights". These lights are not light enough to use to walk around in the dark or read by, but they are perfect for marking tent pegs, camp sites, or trails at, for example, concerts or camp sites. They can also be used to mark latrines which are often some distance from camp sites, and be used in astronomy to possibly read text (although the lights are not very bright).

Tritium gas tubes last about 10 years, but they are expensive and not available legally in the US for hobbyists. Also there are some fakes sold on Ebay that only last a few months. In the US they can only be sold as part of a watch, gun sight or compass.  Ebay does not appear to regulate plain tritium vials sold to the US.