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.
No 40 Credits, No Retirement. Social Security requires a minimum of 40 credits for retirement benefits, whether you take early retirement at age 62 or wait until your full retirement age (which varies between 65 and 67, depending on the year of your birth). If you don't have the 40 credits, you don't draw any retirement.