Today's Newsday had an article entitled "Beware of Bad Tips on Savings for Retirement." One of the myths addressed was that you can take early Social Security retirement when you turn 62 years old, and still get full benefits later.
Some people take early retirement because they want to start receiving monthly payments immediately. The article points out that by doing so, you receive 25% less than if you wait until full retirement age, and 75-80% less than if you wait until age 70. The implication is that it usually makes more sense to avoid taking early Social Security retirement.
The decision about whether to accept early retirement is simpler if you are receiving monthly Social Security Disability ("SSD") benefits. The SSD helps stave off having to take early retirement, which eventually leads to larger retirement benefits.