Male Age and Sperm Quality: How They Affect IVF Success
Learn how male age and sperm health affect IVF outcomes, and what steps can help improve fertility results.
In short: A man’s age gradually affects sperm quality: count and movement fall and sperm DNA damage increases, which can lower IVF success. Solutions include ICSI, testing for sperm DNA fragmentation, stopping smoking, a healthier lifestyle and treating a varicocele if present.
When couples think about fertility, most of the attention goes to the woman’s age. But research increasingly shows that male age also matters — and it can influence sperm quality and the outcomes of assisted reproductive treatments like IVF. While men continue producing sperm throughout life, aging can gradually affect sperm health and function.
How Age Affects Sperm Quality
As men grow older, several natural biological changes can occur in sperm production and quality, including:
1. Decreased Sperm Count
Research suggests that sperm count may gradually decline with age, which can reduce the chances of natural conception.
2. Reduced Sperm Motility
Sperm need good motility to reach and fertilize the egg. With age, both overall and progressive sperm movement tend to decrease.
3. Increased Sperm DNA Fragmentation
One of the most notable age-related changes is a rise in DNA fragmentation within sperm cells. This can affect embryo development and may raise the risk of miscarriage.
4. Increased Genetic Mutations
Some studies suggest that sperm from older men may carry more genetic mutations, which could be associated with a slightly higher risk of certain genetic conditions in children.
5. Other Age-Related Changes
- Decreased sperm quality overall
- Slightly higher incidence of birth defects
- Reduced semen volume
- Lower embryo quality
- Reduced chances of implantation
- Higher miscarriage rates
- Potential genetic risks, including mutations and developmental conditions
How Does Sperm Shape (Morphology) Affect IVF Success?
The shape and structure of sperm can also influence IVF outcomes. Abnormal sperm morphology may be linked to:
- Lower fertilization rates
- Reduced embryo quality
- Higher rates of embryo arrest
- Slower embryo development
- Lower implantation rates
- Increased risk of biochemical pregnancy or early pregnancy loss
It is reassuring to know that when ICSI is used, a low percentage of normally shaped sperm on its own usually has only a small effect on fertilization and pregnancy rates; severe or specific defects (such as globozoospermia) matter more
The Impact of Male Age on IVF Outcomes
While the woman’s age remains the most influential factor in IVF success, a man’s age can still play a role in several outcomes:
Fertilization Rates and Embryo Quality
In many cases, fertilization rates are not dramatically affected by male age alone — particularly when the female partner is younger.
Increased Risk of Miscarriage
Advanced paternal age has been associated with a higher likelihood of miscarriage after conception, often linked to increased sperm DNA fragmentation.
Lower Live Birth Rates in Older Men
Some studies suggest that IVF success may decline when the male partner is over 50, especially when the female partner is also older. One study found that outcomes may be less favorable when the man is over 51 compared with younger men.
Can the Effects of Male Age Be Reduced?
The encouraging news is that modern fertility treatments and lifestyle changes can help offset some age-related effects on sperm, including:
- Intracytoplasmic sperm injection (ICSI) — injecting a single healthy sperm directly into the egg
- Sperm DNA fragmentation testing, especially after recurrent miscarriage or repeated IVF/ICSI failure, to help guide the choice of treatment
- Lifestyle improvements such as quitting smoking, maintaining a healthy weight, and reducing exposure to environmental toxins
- Antioxidant supplementation, when appropriate
- Treatment of varicocele, if present
- Advanced sperm selection techniques for IVF or ICSI
- [Testicular sperm extraction may be considered in selected men with persistently high DNA fragmentation and repeated ICSI failure, although the evidence is still limited
Key Takeaway
Men can father children later in life, but aging can still reduce sperm quality and increase DNA fragmentation — factors that may affect the chances of pregnancy and IVF success, especially when combined with advanced maternal age. That’s why it’s important to evaluate male fertility factors carefully when a couple experiences delayed conception, rather than focusing on the woman’s age alone.
If you and your partner have questions about male fertility factors or are considering IVF, the team at Dr. Najeeb Layyous Clinic can help guide you through appropriate testing and personalized treatment options.
Dr. Najeeb Layyous, F.R.C.O.G
Consultant Obstetrician, Gynecologist and Infertility Specialist
The finest doctor in Jordan — may God bless him and his whole medical team. A doctor in every sense of the word. I advise anyone planning a pregnancy to visit Dr. Najeeb Layyous. His manner is wonderful, always smiling, with the highest ethics; he gives every patient her due, and the patient’s comfort matters most to him. We had been to many doctors and none understood and treated my case except him. Special thanks to him and the whole team, and to Dina in particular — a lovely person. I recommend anyone considering IVF or pregnancy to visit his clinic.