Just discovered this thread...
Having done no proper running since I was at school, I took it up again a little over a year ago, at the tender age of 39 - initially, it was purely for my son's sake, to encourage him to keep fit during the rugby close season, but I really got into it and now I consider myself a keen runner.
I'm another fan of Parkrun - we started off running round the trails in the local woods, which I enjoy, but it was discovering Parkrun that really sparked my enthusiasm, and it's become a regular Saturday morning fixture. I actually did my 50th Parkrun last Saturday, so I'll be getting my snazzy red T-shirt soon. I also go running at lunchtimes two or three times a week now - brilliant way of relieving work-related stress.
I did my first 10k race back in April and I'm quite keen to step it up and do some longer distances, maybe even a marathon, but my next main aim is to get my 5km time down under 20 minutes (current PB is 20.15).
I've also started doing triathlons - it was always the running bit that put me off in the past but that's no longer a barrier. I did my first Sprint tri in May and I'm doing my first Olympic distance this weekend (London). Hopefully it won't be too long before I'm doing my first Ironman...