There still seems to be a lack of literature espousing the benefits of using egg freezing to reduce negative outcomes. On the other hand, evidence indicates no difference in negative fetal outcomes of using egg freezing aside from cost/economic barrier. Risks to the mother of having an advanced age at gestation still remain but the technology is a boon to those who may be have decreased fertility later in life (ex: cancer, autoimmune disease, premature menopause).

With regards to aneuploidy (which includes Downs Syndrome), there is less risk by using oocytes harvested at an earlier age as opposed to later in life.

Great read looking over research from the past decade: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4467930/