People have been donating their eggs for more than 20 years, and research shows they are just as likely to be fertile as people who never donated eggs. While it is true that people are born with a finite number of eggs, it is also true that a limited number are available each month. Only one egg ovulates during a normal monthly cycle. The rest die off and are no longer available. The retrieval process simply takes advantage of the eggs that are not used during the month.