New 2012 data from the Human Fertilisation and Embryology Authority (HFEA) revealed older women were more likely to use donor eggs from other women, most often younger.
The HFEA report also showed that the number of same-sex female couples receiving IVF treatment increased by more than a third between 2010 and 2011.
A total of 766 cycles of IVF were carried out in women who had a female partner in 2011 - 205 more than in 2010, a 36.5% increase. This resulted in 265 babies being born.
Meanwhile, 1271 cycles using donor sperm were performed in women who had female partners in 2011 - 243 more than in 2010, a 23.6% increase. As a result, 161 babies were born.
In 2012, 47,422 women in the UK underwent IVF or a procedure where sperm is injected directly into the egg - intra-cytoplasmic sperm injection - a slight rise on the previous year.