I am 52 years old, an age some people still consider to be young, but an age that seems pretty old to me. I do pose myself the question from time to time about whether it still makes sense to keep learning, or whether I have enough knowledge to allow me to coast on my laurels. My recent excursion into language learning (plus my elbows-deep investigation into Drupal and OpenPublish would suggest which way I've fallen - squarely on the side of continual learning. I don't expect to ever be otherwise; assuming I make it to 83 I expect to be fully engaged in learning and creating (and hopefully cycling 12 miles a day like Grace Adkins). There are all kinds of reasons to encourage lifelong learning, and then there's the other side: when you stop learning, it's over.