Age affects quality & quantity of eggs. But thanks to specialized cryopreservation technique i.e., freezing.
Freezing eggs can preserve them without damage & store them for up to 10 years without affecting quality.

Reasons why women choose to freeze eggs:

 Before going in for chemotherapy or radiation for cancer or surgery. Freezing healthy eggs before the treatment can give her a chance to have a baby once she has recovered.
Thalassemia, sickle cell disease, lupus erythematosus, rheumatoid arthritis where bone marrow transplantation or suppressive therapy is given, fertility preservation is an option.
Family history of early menopause: where there is increased risk of early menopause.
Avoiding problems associated with older eggs. Elderly women have higher risk of birth defects, genetic diseases, miscarriages due to degradation of egg quality with increase age.
Delay child bearing to pursue other goals- like you can’t take time off work, due to carrier demands, want to continue education.

In these cases fertility preservation is an excellent method.