Age is the single most important factor determining IVF success. Understanding realistic
success rates for your age group can help you make informed decisions about your fertility journey.
IVF Success Rate by Age — Kolkata 2025
Under 35
55–70%
Best time to pursue IVF. Highest egg quality.
Age 35–40
40–50%
Still strong. PGT helps select best embryos.
Above 40
20–35%
Donor eggs can achieve 50–65% success rates.
Cumulative Success Rates (Multiple Cycles)
| Age Group |
After 1 Cycle |
After 2 Cycles |
After 3 Cycles |
| Under 35 |
55–70% |
75–85% |
85–90% |
| 35–40 |
40–50% |
60–70% |
70–80% |
| Above 40 |
20–35% |
35–50% |
45–60% |
These are approximations. Individual results depend on ovarian reserve, embryo quality, and
uterine health.
Why Age Affects IVF Success So Strongly
- Egg Quality: Older eggs have higher rates of chromosomal abnormalities,
reducing fertilization and implantation rates.
- Ovarian Reserve: AMH levels decline with age — fewer eggs retrieved = fewer
embryos to choose from.
- Uterine Receptivity: While the uterus itself ages well (as shown by successful
donor egg IVF in older women), egg quality is the primary limiting factor.
- Miscarriage Rate: Higher chromosomal abnormalities in older eggs lead to higher
early pregnancy loss rates.
How to Improve Outcomes After 35 or 40
- PGT-A: Preimplantation Genetic Testing screens embryos for chromosomal errors,
dramatically reducing miscarriage risk.
- Blastocyst Transfer: Culturing embryos to Day 5 selects only the strongest ones
for transfer.
- Optimize Health: Vitamin D, CoQ10, and DHEA supplementation may improve egg
quality (discuss with your doctor).
- Donor Egg IVF: Using eggs from a young donor can achieve 50–65% success rates
even for women above 45.
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