Unfortunately, there is no such time limitation for charging this as a felony offense. The following language is from section 49.09:
(b) A DWI offense is a felony of the third degree if it is shown on the trial of the offense that the person has previously been convicted:
(2) two times of any other offense relating to a DWI.
As you can see, the statute does not provide any time limitations to charge a felony offense. As such, your prior offenses can be used against you to charge this offense as a felony.
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With the '90 and '91 offenses being so old, the prosecutor may work with you on reducing this charge so that it will not be a felony. You haven't mentioned any of the facts as of yet, hopefully some of them weigh in your favor. For example:
Any such things could be used by a competent criminal defense attorney to your benefit. If the facts weigh sufficiently in your favor, a reduction in the charge would be a possibility.
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