Nope, not normal. Peyronie's disease usually affects men between the ages of 40 and 60 and can make sexual intercourse difficult, if not impossible. It is not known why the plaques form, but many cases of Peyronie's disappear on their own. Medications are available as well, and surgery can also be used to straighten the penis. It is treatable.
Many factors can contribute to impotence, the inability of the penis to become erect or stay erect.
As you age, often you take more medications to treat other conditions that can affect your ability to have intercourse. Third, levels of hormones such as testosterone often dip. My doctor told me I have an enlarged prostrate, but I don't have any symptoms, so we don't need to do anything about it. Many men have an enlarged prostate, especially as they age. The prostate gland contributes fluids to the semen used to transport sperm.