Seriously. This isn't a case of penis envy. It's the results of a study that says the male sex hormone raises the risk of heart attacks.
According to an article on Altpenis.com:
Men are more likely to die of heart disease than women of a similar age and sex hormones are to blame, according to a new study by researchers at the University of Leicester in the United Kingdom. Study leader Maciej Tomaszewski suggests that this "male disadvantage" is likely related to the sex-specific effects of naturally occurring sex hormones.
The research, published in the journal Atherosclerosis, looked at ways that the sex hormones - estradiol, estrone, testosterone and androstenedione - interacted with three major risk factors of heart disease (cholesterol, blood pressure and weight). It was established that two of these sex hormones (estradiol and estrone, known as estrogens) are linked to increased levels of LDL (bad) cholesterol and low levels of HDL (good) cholesterol in men.
So does this mean older men should keep it in their pants? No, this just means that men have to work out and keep their weight down if they want to continue having sex into their old age.