How old do you look? More importantly, how old do you feel?Oftentimes, age is a subject we're all aware of but desperately try to avoid in polite society. The older we get, the more taboo age becomes. But why?26-year-old Caleb Meakins is in the midst of a personal challenge called My 40 Days in which he undertakes a new dare each day in order to help him overcome his fear of failure. Even if we deny it, all of us experience a fear of failure to some extent, whether when delivering a project at work or trying to live up to the expectations of our friends and loved ones. Instead of living with that fear, Meakins decided to do something about it. On day 28, Caleb took to the crowded streets of London with one simple but terrifying task: to try and guess strangers' ages. Most of us have learned one way or another that this is a social no-no, but why? What Meakins had to say about this social norm might just change the way you think about age forever.