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You could create a smart list to track this. Here is an example. You will just want to change the filter to 18 months instead of the 180 days I have put there.
This could take a long time to run so you might want to create a smart campaign to add the leads that match the criteria to a static list.
Let me know if you need more directions.
Here's an example of a smart campaign flow step to add to a list:
Great thanks!! Looks like I was on the right track, but didn't realize I could select "is any" from the dropdown menu in the Opens filter.