While the age of 65 represents the age most closely associated with the notion of retirement, there are many other ages to consider. For instance, one can begin collecting social security benefits at the age of 62. However, that may not be a great idea since is one is to claim their full social security benefit, one needs to sign up for social security at one’s full retirement age. Full retirement age varies by birth year. Indeed, full retirement age is defined as 65 for those born in 1937 or earlier.