In most cases, once you reach age 73, the IRS requires you to take RMDs annually from retirement plans, including traditional, SEP and SIMPLE IRAs.
There are some exceptions when the assets are still held in an employer retirement plan, like a 403(b), 401(k), profit-sharing or other defined contribution plan. If you’re still working for the employer that sponsors your plan, you can generally wait until the later of retirement or until you’re 73 to begin taking your RMD.
Consult with a tax advisor or financial professional for help on your situation.