The lion cub pictured above is named Gabriella and lives at an animal orphanage in Nairobi. The Pride of Kenya website reports she lives there because she was left parentless due to a human-lion conflict. (Presumably this explanation means her mother was killed by humans). The post about her goes on to say that her life expectancy in captivity is about 22 years.
Wild lions dying out in Kenya
Within twenty years they may disappear completely.