Most people are unaware of the symptoms, wouldn't discuss them with a doctor and don't know the treatment options ...

Experts told ABC News it’s not uncommon for older prostate cancer patients, like former President Joe Biden, to receive a diagnosis when the disease is advanced.

While most prostate cancers grow slowly, aggressive varieties like the former president’s can progress much more rapidly.

The former president's type of cancer is "generally not considered a curable situation,” Dr. Christopher Wee, a genitourinary medical oncologist with the Cleveland Clinic, tells PEOPLE.