Also there is a specific error associated with eggs. It has to do with chromosome numbers. Is specific to disorders like downs syndrome and miscarriage. Called "aneuploidy".

https://scholar.google.com/scholar?as_ylo=2022&q=chromosome+errors+in+embryos+age+of+parents+&hl=en&as_sdt=0%2C14#d=gs_qabs&t=1771178714217&u=%23p%3DMnn8vjTVXIcJ Influence of parental age on chromosomal abnormalities in PGT-A embryos: exponentially increasing in the mother and completely null in the father

Whereas sperm dna declines faster with age and is more prone to damage/changes from environmental factors like diet, exposure to chemicals, and the like.

https://www.mdpi.com/2073-4425/14/2/486 Impact of Advanced Paternal Age on Fertility and Risks of Genetic Disorders in Offspring

I suppose if someone was planning or at least considering the possibility of having biological children after age 35 (mother and/or father) then it would be realistic to save back sperm and egg from an earlier age to reduce multiple types of risk.