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.
Your Social Security retirement benefit is based on your earnings record over your career. You need at least 40 credits (10 years of work for most Americans) to qualify for retirement benefits, and the 35 years with your highest earnings count toward your benefit level.ge 65: When you first qualify to take Medicare. Your full retirement age: When you can start collecting your full Social Security benefits and work while collecting Social Security without a penalty.