A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.
If you were born in 1929 or later, you need to work at least 10 years to become eligible for Social Security. The SSA determines eligibility with a system of credits. Basically, you earn up to four credits for every year worked, and you need a total of 40 credits to qualify for Social Security.
(You can start the sign-up process here up to three months before the month of your 65th birthday.) By contrast, you can start collecting Social Security anytime from age 62 to 70 and the later you start, the bigger your benefit. Just how much bigger depends on when you were born. Americans born from 1943 to 1954 have a ânormalâ or âfullâ retirement age of 66.