If you could save all your social security payments, how much would you have after 10 years or 20 years? Is it better to start collecting social security at 62 or wait until 70? This will depend on your interest rate. Use this wonderful quick and simple app to see which is better. Quickly use a slider to choose your monthly amount and to set your interest rate. Quickly scroll to see your yearly totals up to age 100. Quickly tap to change your starting year from 62 to 67.