India’s urban men are starting families later than any previous generation. Longer education, career-first priorities, delayed marriage and financial planning have pushed the average age of first-time fatherhood steadily upward in cities across the country. Men in their late thirties and forties attempting to conceive for the first time is no longer unusual – it is increasingly the norm among certain professional demographics.
What is less well understood is that male fertility is not static across time. Sperm DNA quality changes with age in ways that a standard sperm analysis test will not always detect, and the consequences – for conception, for IVF success rates and for pregnancy outcomes – are real and worth understanding before making decisions about when to seek help.
HOW MALE FERTILITY CHANGES WITH AGE
Unlike female fertility, which declines sharply around the mid-thirties as egg reserves diminish, male fertility changes more gradually. Men continue producing sperm throughout their lives. This leads to a widespread assumption that paternal age does not matter – that as long as a man has sperm, his age is irrelevant.
That assumption is not accurate.
Sperm production is a continuous process, but the machinery that drives it – the DNA replication, repair mechanisms and hormonal environment that support healthy spermatogenesis – becomes progressively less efficient with age. The result is sperm that may appear normal under a microscope but carry a higher burden of DNA errors.
Testosterone levels also decline with advancing age, a process sometimes called andropause or late-onset hypogonadism. Testosterone is essential for sperm production, and its reduction affects both the quantity and quality of sperm generated. This is one reason why a hormone test for men is a valuable part of fertility evaluation for men over 35, alongside conventional semen analysis.
THE SPECIFIC PROBLEM OF SPERM DNA FRAGMENTATION
The most clinically significant age-related change in sperm quality is the accumulation of DNA damage. As men age, the proportion of sperm carrying fragmented or damaged DNA tends to increase. This happens for two main reasons.
First, DNA repair mechanisms within the testis become less effective over time, meaning that errors introduced during the sperm production process are less likely to be corrected before sperm are released.
Second, oxidative stress accumulates with age. Older men tend to have higher levels of reactive oxygen species in their semen, which directly damages the DNA packaged within sperm.
The consequence is a higher DNA Fragmentation Index – the measure used in a sperm DNA fragmentation test to assess what proportion of sperm in a sample carry damaged DNA.
A high DFI matters for several reasons. Sperm with fragmented DNA can still fertilise an egg. The problem arises in what happens next. Embryos formed from sperm with high DNA damage are less likely to develop normally, less likely to implant and more likely to result in early pregnancy loss. This is why paternal age is now recognised as an independent risk factor for miscarriage and IVF failure, even when the female partner’s fertility is entirely normal.
WHAT THE EVIDENCE SHOWS FOR IVF AND ICSI
For couples undergoing IVF or ICSI, paternal age and sperm DNA integrity are increasingly recognised as important factors in predicting outcomes. Research has shown that:
Fertilisation rates may be maintained in older men, meaning the initial step of sperm meeting egg is not necessarily the problem. The issue tends to emerge at later stages – blastocyst development, implantation and early embryo viability.
Embryo quality is affected by sperm DNA status. Embryos derived from sperm with high DNA fragmentation show poorer development to the blastocyst stage, which is the point at which embryos are typically selected for transfer.
Cumulative IVF success rates decline as paternal age increases, even after accounting for female age and embryo quality. This is a finding that has become more consistently reported as reproductive laboratories have begun measuring sperm DNA fragmentation as part of their pre-treatment assessment.
For men over 40 undergoing IVF or ICSI, a sperm DNA fragmentation test is not an optional add-on – it is information that directly affects how the treatment should be approached.
WHAT MEN OVER 35 SHOULD DO
The good news is that understanding your sperm DNA status gives you the ability to act on it. Unlike age itself, sperm DNA fragmentation is not fixed – it can improve with targeted intervention.
Get a DFI test. A sperm DNA fragmentation test measures your current DNA Fragmentation Index and tells you whether your sperm DNA status is likely to be a factor in any fertility difficulties you are experiencing. This is a more informative starting point than a conventional semen analysis test alone, particularly for men over 35.
Consider a hormone test for men. Testosterone, FSH, LH and prolactin levels all influence sperm production. Hormonal imbalances that develop gradually with age are often not symptomatic in obvious ways – they are picked up through testing. Addressing a hormonal issue can have a meaningful impact on sperm quality.
Allow time before treatment decisions. If results show elevated DNA fragmentation, a period of lifestyle optimisation – addressing oxidative stress through diet, reducing alcohol, quitting smoking and treating any underlying health conditions – can produce measurable improvement in DFI scores within two to three months. This may improve the outcome of any subsequent fertility treatment.
Discuss findings with your fertility specialist. Sperm DNA data changes the clinical picture in a number of ways – it may influence the choice between IVF and ICSI, the decision to use fresh ejaculate versus testicular sperm, and the timing of any embryo transfer.
DELAYED FATHERHOOD IS COMMON. KNOWING YOUR FERTILITY STATUS IS ESSENTIAL.
There is no social judgement attached to starting a family later in life. However, there is a practical case for understanding your fertility health clearly, rather than assuming that age is unlikely to be a factor. The men most likely to benefit from sperm DNA assessment are precisely those who feel healthy, have no obvious symptoms and have never had reason to think about their fertility before.
If you are a man over 35 who is planning to conceive – naturally or through IVF – a DFI test is the most informative single step you can take.
At Andrology Center, we carry out the specialised SCSA® test for Sperm DNA Fragmentation, and are the only laboratory authorised in India to carry out this specific test. For more information, please do contact us.
