It depends on how many prior convictions you have. If you only have one prior conviction, they will look back ten years. If you have two or more prior convictions, they look back over your entire lifetime, although if all you have are simple OWI convictions, anything prior to 1989 should have fallen off your record.
This answer is provided for general information only. No legal advice can be given without a consult as to the specifics of the case.
There is one small exception though. If you only have one prior OWI conviction that is more than 10 years old, your second charge would be issued as a 1st-Offense (often referred to as a second 1st). However, if you are convicted of a second 1st-offense under those circumstances, your next OWI would be charged as a 3rd Offense because of the two priors, even though neither of the priors were charged as an OWI-2nd.
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