Oldest human embryo used in a successful pregnancy

The oldest human embryo used in a successful pregnancy is at least 31 years 56 days old, as verified with the birth of Thaddeus Daniel Pierce (USA) to Lindsey and Tim Pierce (both USA) in London, Ohio, USA, on 26 July 2025.

The embryo was one of four created in May 1994 during IVF by Linda Archerd (USA) and her then‑husband. One resulted in a daughter born in 1995 and the remaining three were frozen and later donated through an embryo‑adoption program. After being matched with the Pierce family, two of the embryos were transferred in November 2024 at Rejoice Fertility clinic in Tennessee, and one survived and developed into Thaddeus.