Should it be:
(1 or 2 or 3 or 4 or 5 or 6) and 7
So to exclude both Leads created in the past 6 months and Leads created more than 6 months ago but having done any of these interactions in the past 2 years?
I would also use filter SFDC Type is Lead to build your audience (just in case you have records in your Database that have SFDC is empty)
As it can get confusing using "not" filters, you may want to create a Smart List of people who match the criteria (i.e. was created in the past 2 years), and then exclude this List from your actual audience (Not member of Smart List)
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