Click here for some examples of people who found extraordinary success with new business "late in life": http://digitalsynopsis.com/inspiration/never-too-late-start-venture/
Ray Croc, the founder of McDonalds, sold paper cups and milkshake mixers until 52. Ariana Huffington started Huffington Post at 54. John Pemberton invented Coca Cola at 55.
Of course, no one is saying that these people started these companies and were successful with their first attempts. Some household names went through several businesses until they found the idea that took off. Some ideas are worth waiting for in the life of an entrepreneur.