1. an individual that is "emotionally" incapable of life in the real world or taking care of ones self.

2. a person that takes advantage of opportunities offered by friends and family with no thought to the effort put out by them on his behalf.

Adj. Something that is expected to have a long lifespan by virtue of having existed for a long time, based on the lindy effect, named for the New York restaurant Lindy's, coined by Albert Goldman and popularized by Nassim Taleb.