I'm in My 60s -- Proof That It's Never Too Late to Launch a Startup

I'm an entrepreneur in my 60s, and there's a 21-year span between my first venture and latest startup, which is the third successful business I've launched. What I learned in my 40s and 50s helped me become a successful innovator, so like judgment and wine, entrepreneurship gets better with age. Here are my five hard-earned lessons, which apply to every entrepreneur and work across all industries.