Are there any risks associated with the eggs being frozen for longer?
So far as we know, there are no additional risks. The main risk is you spend a lot of money on keeping them frozen for longer.
Can you freeze an egg for 20 years?
Almost certainly yes
Or even if there are some risks, is it the case that over any timespan you’d rather have an egg in the freezer than in the woman?
If you’re planning to have your final kid within a year, freezing eggs doesn’t really make sense unless you’re older and you need to bank a lot of eggs to have a good shot at having that kid.
For anything over a year, freezing eggs makes sense for fertility preservation.
So far as we know, there are no additional risks. The main risk is you spend a lot of money on keeping them frozen for longer.
Almost certainly yes
If you’re planning to have your final kid within a year, freezing eggs doesn’t really make sense unless you’re older and you need to bank a lot of eggs to have a good shot at having that kid.
For anything over a year, freezing eggs makes sense for fertility preservation.