I saw this for the first time when I was eleven years old. At that time, the plot, action and SFX were what drew me. When I watched it again later in adulthood, the SFX hadn’t aged well but I still appreciated it for other reasons, namely the performances and chemistry of the cast. Nothing like staggering half-cut down the street after closing time with some friends shouting, “Fish, and plankton. And sea greens, and protein from the sea. It’s all here, ready. Fresh as harvest day!”
Are you conflating "Logan's Run" with "Soylent Green?"
Regards,