Typically, 21-40. We’ve had cases up to 45 get approved by an IVF clinic, but it’s rare.  Every prospective surrogate must be at least 21 years old before she can be approved for surrogacy. This minimum age requirement is set by the American Society for Reproductive Medicine, based on what experts have identified as the best indicators of success for a gestational carrier. But most importantly age restrictions exist only to protect the surrogate and the baby’s health and give the best chance for successful outcomes!