Icon is an IRA and the rules for using your retirement savings for this plan are governed by the IRS.
You can start accessing your savings once you've reached 59½. However, it's a good idea to let your retirement savings remain untouched as long as possible, this will help make sure you have enough money to live on when you need it most.
At age 70½ you will be required to take minimum distributions. For more specific information on required minimum distributions you can visit the IRS website.