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Age of sperm

This decline in fertility occurs irrespective of whether the sperm are stored at 5 degrees C or at 15 degrees C, but the rate is greater once storage temperatures exceed 25 degrees C. Sperm motility can be maintained for extended periods in an environment where the extracellular oxidative stress is minimized by reducing the oxygen tension, by addition of antioxidants and chelating agents; however, this will not prevent a significant drop in fertility after five days of storage at ambient temperature. The requirement of energy by the sperm-motility apparatus demands a high level of respiratory activity. This system is very active and the free radicals produced in vivo during this process could lead to chromatin damage. As no internal repair mechanism exists in sperm, an extraneous supply of protectants, or an environment where damage is minimized, is essential to maintain its fertilizing potential.
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Semen quality

Age of sperm
Age of sperm
Age of sperm
Age of sperm
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Why You Might Want to Freeze Your Sperm Before Age 35

An abnormal sperm count may also indicate an underlying health condition. A normal sperm count ranges from 15 million sperm to more than million sperm per milliliter mL of semen. Anything less than 15 million sperm per milliliter, or 39 million sperm per ejaculate, is considered low. A low sperm count is often referred to as oligospermia. A high, or above average, sperm count is over million sperm per millimeter. You can determine your sperm count through a semen analysis. The number, shape, and mobility of sperm are important for testing for male factor infertility.
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Men's sperm quality decreases at age 35

The trend in parenthood at an older age has also been seen in men. Age-related infertility will continue to be a problem. A basic understanding of the issues is critical for health care professionals so that they can effectively counsel patients who are considering a delay in childbearing for social reasons or for those seeking fertility treatments.
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By Jessica Hamzelou. Older fathers are now known to pass on more genetic mutations to their children than older mothers do. And children of older fathers are more likely to have autism and schizophrenia. Growing evidence suggests that older dads might pass on health risks through epigenetic tags on the DNA in their sperm. These tags alter how active genes are, and lifestyle factors such as diet and smoking are known to make epigenetic changes that may affect the next generation.
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