During the 20th century alone, the population in the world has grown from 1.65 billion to 6 billion. In 1970, there were roughly half as many people in the world as there are now. Because of declining growth rates, it will now take over 200 years to double again.
In some cases you can take a different medicine that doesn't cause erection problems. Taking prescription medicine that can help you get erections. These include pills such as sildenafil (for example, Viagra), tadalafil (for example, Cialis), and vardenafil (for example, Levitra).
8 doctors agreed: 1  ED: Men may lose some ability to have an erection at any age, but the younger man most likely will have some other medical issue leading to it. Diabetes, hypertension, heart disease, nerve problems, stress, depression and low testosterone may be factors.