I've been on this planet for seven decades, now. We don't need to know exactly how many; but you will get a clue when I tell you I "fought" in the Cold War and stood on the the roof of Tower 1 of the World Trade Center before it was completed.
I also predate touch-tone phones. Don't go away! Before you start to think I'm too old, don't even think about beating me out for a taxi on the corner of 47th and Broadway. So, relax check out my posts from time to time. It will probably be good for your health.