Anti-viral drugs can successfully make old human eggs young again
Women are born with all of the eggs they will ever have, unlike men, whose reproductive organs create millions of new sperm every day. The quality of the chromosomes and DNA contained within each egg declines as women age, which is why the average 20-year-old has an 86 percent chance of becoming pregnant, whereas this drops to 36 percent for a 40-year-old.
https://interestingengineering.com/anti-viral-eggs-young