The debate over how old is too old to have a baby is a contentious one. On the one hand, why should a woman be denied the right to try for a baby, whatever her age? On the other hand, there are medical risks surrounding having a baby after a certain age that should be considered.
Age plays such a pivotal role in fertility – a woman's 'biological clock' influences both natural conception and the success rates of assisted reproductive technologies like in vitro fertilisation (IVF).
In the UK, while there isn't a strict legal age limit for undergoing IVF, various guidelines and clinical recommendations shape access to treatment, especially concerning NHS-funded services.
Understanding Fertility and Age
Female fertility naturally declines with age, primarily due to a decrease in both the quantity and quality of eggs. This decline becomes more pronounced after the age of 35 and accelerates further beyond 40.
Consequently, the chances of natural conception diminish, and the success rates of fertility treatments like IVF also decrease.
However, in the UK, the age at which individuals seek IVF treatment has been steadily increasing. According to the Human Fertilisation and Embryology Authority (HFEA), the average age of women starting fertility treatment has now surpassed 35 years.
For real experiences of navigating fertility later in life, our podcast Workplace Benefits Unwrapped features an episode on fertility over 40 — the decisions involved and what women wish they'd known.
Age Limits and IVF Treatment
IVF Success Rates by Age
Age is a critical determinant of IVF success, with rates declining as maternal age increases, due to a decrease in egg quality and quantity. Data from the HFEA on IVF successful treatments indicates that rates for those over 40 are increasing.
IVF pregnancy and birth rates by age
- Preliminary average IVF birth rates using fresh embryo transfers for patients aged 18-34 were 35% per embryo transferred.
- For patients aged 40-42 pregnancy rate per embryo transferred increased from 10% in 2012 to 16% in 2022.
- For patients aged 43-44 pregnancy rate per embryo transferred increased when using their own eggs from 5% in 2012 to 9% in 2022.
NHS Guidelines on IVF Age Limits
The National Institute for Health and Care Excellence (NICE) provides recommendations for age limits for IVF treatments funded by the NHS.
Women under 40: Eligible for up to three full cycles of IVF if they've been trying to conceive for two years or have undergone 12 cycles of artificial insemination, with at least six using intrauterine insemination (IUI).
Women aged 40 to 42: Eligible for one full cycle of IVF, provided they meet specific criteria:
- Have not previously undergone IVF treatment.
- Show no evidence of low ovarian reserve.
- Have been trying to conceive for two years or have had 12 cycles of artificial insemination, with at least six using IUI.
- Have discussed the implications of IVF and pregnancy at this age with their healthcare provider.
These are, however, only guidelines, and...
