Typically, fertility clinics and surrogacy agencies accept women who are between the ages of 21 and 4 because these are the healthiest years for a woman to carry a pregnancy. At 18, it is more unlikely that a woman has already given birth to a child. In any case, it depends on a case-by-case basis.
Read the full article on: How to Become a Surrogate Mother – Requirements & Qualifications ( 75).

Andrea Rodrigo
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.