It is is a novel by William F. Nolan and George Clayton Johnson. Published in 1967, it depicts a dystopic ageist future society in which both population and the consumption of resources are maintained in equilibrium by requiring the death of everyone reaching a particular age. The story follows the actions of Logan, a Sandman charged with enforcing the rule, as he tracks down and kills citizens who "run" from society's lethal demand — only to end up "running" himself.
In 1976, Logan's Run was turned into a movie starring Michael York, Richard Jordan, Jenny Agutter, Peter Ustinov, and Farrah Fawcett. The movie opened with mixed reviews but has since grown into a cult classic and scifi masterpiece.
If you have not seen the movie you really should take the time to watch it. It's a good movie hat has been rumored for a long time to be remade into a big budget film.
Keith Goldman has transformed the sexy party dystopia of Logan's Run into a massive Lego diorama; scenes from the film are interspersed in the nooks and crannies. His creations are awesome! The attention to detail is second to none.
You can check out further scene recreations at Keith's