The decline in sperm counts is a growing concern worldwide, with rates plummeting by as much as 52% since the 1970s. This alarming trend has far-reaching implications for human health and reproduction, raising questions about the future of fertility and the potential consequences for individuals, families, and society as a whole.
There’s lots of different ways to measure sperm health and ultimately sperm count isn’t really that much of an impediment to eventually knocking someone up, unless it’s very very low - see this study graph
https://www.nature.com/articles/s41585-022-00626-w
17 August 2022 - Spatiotemporal trends in human semen quality