Melani Lowman-Walton & Rob Walton

Serving as a board member at Walmart, Rob Walton’s net worth is a whopping $53 billion, as of 2019. While not much is known about how the two met or began dating, it’s worthy of note that Rob is about 30 years Melani’s senior, meaning their relationship has one of the biggest age gaps out of all on this list.

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The pair officially married in 2005, making it the third marriage for Rob. Melani is very accomplished in her own right, too, with experience in working as a basketball coach, athletic trainer, and commercial real estate agent.