science

Well neither sex is "expired" at 30. Because people have much higher value than their breeding potential.

But in terms of passing on the best of yourself to your offspring, . Yeah there is a loss of quality over time.

That quality loss might be higher in males (,because of sperm properties) but ultimately yes, it would be better to save eggs and sperm from an age before 30.

I wouldn't choose a partner based on how old they are though. There are much more important factors like if they would be a good parent.