If you retire at age 64 how mch can you earn while working and still collect Social Security and do you have to pay your own Medicare payment?

You pay for Medicare through your social security. They take a deduction out of your payment. Your full retirement age depends on when you were born. For example if you were born in 1955 you can get benefits at 62, but you would only receive 741.00 out of 1,000 you would be eligible for if you had waited until 67. This equals a 25% reduction in lifetime benefits. You also have to consider if you ave a pension. 401K, mortgage, savings impact when you should retire. The social security website has a retirement planning page I suggest you visit.