Bill Gates says he and his ex-wife, Melinda French Gates, plan to run foundation together for 25 more years

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• Bill Gates and ex-wife Melinda French Gates hope to keep their foundation running for 25 more years, at which point he'll be 91 and French Gates will be 83.
• "We think spending all the money in that time frame makes sense," Gates told Forbes.
• He says they'll be focused on infectious diseases with the aim to "bring those largely to an end."

The Bill & Melinda Gates Foundation has been around for 25 years, and Bill Gates says that's just its halfway mark.