I go by the 20-year rule.

If a girl is 20 or fewer years younger than the guy, it can be a legitimate relationship. That's not to say gold digging doesn't occur when there's an age difference of 15 years or whatever, but my point is that there are also legit relationships in that age difference which don't revolve around money.

Once you pass 20, the chance it's a gold digging situation starts to go up exponentially.

Once you get to 30, it's almost 100% a gold digging situation.

Obviously in this case (approximately 50 years), we all know this chick wouldn't be with Belichick if he weren't rich/famous.