Relationship between age and semen parameters in men with normal sperm concentration: Analysis of 6022 semen samples

Summary This study evaluates retrospectively the relationship between age and semen parameters among men with normal sperm concentration. It was based on computerized data and performed in an Academic Fertility and IVF Unit. Six thousand and twenty‐two semen samples with sperm concentrations of ≥20 × 106 ml−1 were examined according to WHO criteria and analysed in relation to patients’ age. For each age group, mean values ± SD of semen volume, sperm concentration, percentage of motile spermatozoa, normal morphology, acrosome index, total sperm count/ejaculate, total motile sperm count/ejaculate and sexual abstinence duration were examined. A peak semen volume of 3.51 ± 1.76 ml−1 was observed at age ≥30 to