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.
November 19, 2010. Social Security recommends applying for retirement benefits three months before you want them to begin, because processing can take two months or longer. In most cases, you can apply as early as four months in advance. Retirement payments arrive one month after the qualifying month, so you'll receive the deposit for a June start date in July. Social Security approves your application 30 to 60 days before it makes the first payment.