What age actually does to eggs
You spent your twenties carefully avoiding pregnancy. Now you are 37, reading egg-quality threads at midnight, and wondering whether you waited too long.
Here is the part nobody softens well. You are born with all your eggs, and as they age, more of them carry chromosomal errors. That is why both natural conception and miscarriage rates shift with age.
In embryo analyses, the share of chromosomally abnormal eggs climbs from around half in the mid-thirties to roughly two-thirds by the early forties. The decline is real, and it is mostly about quality, not just quantity.
What you can and cannot change
You cannot make your eggs younger. No supplement, tea, or protocol reverses the chromosomal clock, and anything sold on that promise is overstating the science.
What you can do is stop adding to the damage. Eggs mature in an environment shaped by your overall health, and oxidative stress from smoking, heavy drinking, and poorly managed metabolic health makes that environment worse.
A 2026 systematic review in Frontiers in Endocrinology looked at interventions to improve fertility in women aged 30 to 42 and sorted them by strength of evidence. The clearest wins were the unglamorous ones: a healthy weight, not smoking, limited alcohol, treating conditions like thyroid disease or PCOS, and managing stress. These do not rewind egg age, but they remove obstacles and support the eggs you have.
The levers worth pulling
Aim for a healthy, stable weight, since both very high and very low body fat disrupt ovulation. Eat in a broadly Mediterranean pattern, which has the most consistent fertility data.
Move regularly without overtraining, prioritise sleep, and get a smoking-cessation plan if you need one. Folate before conception protects the developing baby, so a prenatal vitamin is worth starting early.
The honest framing: these steps improve your odds at the margins and protect a pregnancy once it happens, but they are not a substitute for time-sensitive testing.
When not to wait
Age changes the maths on how long to keep trying before getting help. Under 35, the usual advice is to seek testing after a year. At 35 or older, that drops to six months.
Basic fertility tests can include AMH and other hormones to estimate ovarian reserve, a thyroid check, and a scan, plus a semen analysis for a male partner. These do not predict exactly when you will conceive, but they flag issues that benefit from earlier action. If you already have irregular cycles, known PCOS or endometriosis, or a history of pelvic surgery, it is reasonable to ask for testing sooner rather than waiting out the clock.
Get the timing right
If you are 35 or older and have been trying for six months, or younger with irregular cycles or a known reproductive condition, that is the point to see your doctor or a fertility specialist. Earlier assessment widens your options, including egg freezing if you are not ready to conceive yet. A specialist can interpret your results in the context of your age and history rather than leaving you to read forums alone.
References
- Evidence-based interventions to restore or improve female fertility in women aged 30-42 years: a systematic review. Frontiers in Endocrinology. 2026. Link
- Franasiak JM, et al. Aneuploidy across maternal age (analysis of embryos). Fertility and Sterility. PubMed search
- World Health Organization. Infertility affects 1 in 6 people globally. 2023. WHO
- Office on Women's Health (NWHW 2026 focus areas). 2026. Link