Depending on who you read, the age range on this 'alley' can be 40 - 70 years old. I consider it 60-65, and I view it as the age range in which you are likely to develop a health condition that defines your retirement. Although a negative term, it can serve a purpose by making you stop and evaluate your lifestyle and health choices. I know several people who have been 'sniped' with near misses, and they have had a positive impact.