Required Minimum Distributions (RMDs) generally are minimum amounts that a retirement plan account owner must withdraw annually starting with the year that he or she reaches 70 ½ years of age or, if later, the year in which he or she retires.
When you inherited the IRA, if you treated it as your own and it was changed to your name, you would need to look at your own age for any RMD.
When you turn or turned 70 1/2 then you would have to take RMD.
You must take your first required minimum distribution for the year in which you turn age 70½. However, the first payment can be delayed until April 1 of the year following the year in which you turn 70½. For all subsequent years, including the year in which you were paid the first RMD by April 1, you must take the RMD by December 31 of the year.
If an account owner fails to withdraw a RMD, fails to withdraw the full amount of the RMD, or fails to withdraw the RMD by the applicable deadline, the amount not withdrawn is taxed at 50%.
First you need ot make sure you are required to make RMD withdrawals.