@reg66 , perhaps I misunderstood your situation. To be eligible to make a QCD from the inherited IRA maintained for your benefit, you must be age 70½ or over. The age of the decedent is not a factor.
If on past tax returns you reported making QCDs from the inherited IRA but you were not age 70½ or over at the time of the distribution, you must amend those tax returns to remove the QCD claim and instead report the distributions as ordinary distributions and claim the charitable contributions as ordinary charitable contributions. (However, keep in mind the statute of limitations on the IRS's ability to make an assessment of taxes, either 3 years or 6 years depending on the amount.)
Prior to the developers correcting TurboTax's behavior in 2020, TurboTax mistakenly based eligibility to make a QCD on the age of the decedent instead of on the age of the beneficiary. If those prior versions of TurboTax allowed you to report these distributions as QCDs, perhaps this mislead you to mistakenly believe that eligibility to make a QCD was based on the age of the decedent.
