Egg freezing was once an option out of reach for many women, and often isolated for use in women post chemotherapy, or who have other medical conditions or receive treatment which may affect fertility. Now, egg freezing is more accessible and more affordable, and thus is an option to women who may want children in the future, but not be in a position to start trying to conceive. Critically, age at the time of egg collection for freezing is important. We know that egg quality declines with age, and studies have shown us that optimal egg thawing for fertility treatment occurs with eggs retrieved from women under the age of 35 years old. 1
1 Reference: https://www.pregnancybirthbaby.org.au/trying-for-pregnancy-after-35#fertility