OpenAI investor Vinod Khosla, who's 68, says he still works 80 hours a week and plans to keep investing for the next 25 years

• OpenAI investor Vinod Khosla said he still works 80 hours a week during an episode of "The Cerebral Valley Podcast." 
• The 68-year-old billionaire said he plans on investing for the next 25 years if his health permits. 
• He even pointed to life extension efforts as a possible way to prolong his career. 

Vinod Khosla, a Silicon Valley investor for almost 40 years, said in the past that he works 80-hour weeks. And the grind doesn't appear to stop anytime soon.