Mark Twain wrote: "Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
And this is why I went on 'semi-retirement'. I turned 58 in 2011. Twenty years from now I will be 78, if I am still alive. And if I am blessed with health and energy, there is still a lot of things I hope to do!