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.
Social Security: What Every Woman Needs To Know. How do I become eligible for benefits? 1  As a worker: You must work and pay Social Security taxes for at least 10 years (40 quarters), and be at least 62 years old.  As a spouse or divorced spouse: You must be at least 62 years old.