56 years is kind of an upper bound on microwaving plastics (for the sake of argument, let's focus on that for now), and that's when it started. It means people

56 years is kind of an upper bound on microwaving plastics (for the sake of argument, let's focus on that for now), and that's when it started. It means people who were born then and are < 56 years old now might've been exposed to some fraction of (not even nearly the same amount) as much plastic as people born today would be. If we posit that the current exposure levels might cut a few years off the human live... as a layman, naively speaking, can I really expect anybody to have even noticed this in the last 56 years? And given scientific studies like this take years/decades to bear fruit, why would anyone expect this to have been an established fact if it were true? (I get that this isn't your personal argument; I'm trying to figure out why this argument might seem plausible to other laymen.)