As a person ages, it's probably best ( at age 40+) to monitor your health and try to stay on top of things. In other words, if you're a woman, don't ignore the PAP or even the mammogram and if you're a man, start the PSA tests so that a baseline can be established.
What's shocking to read, is how many women actually develope breast cancer in their 20s and 30s, and never seek medical treatment until the disease is advanced.