I've done it 3 times now! It always looks daunting but once you are into it, things just seem to slip into place. I always seem to revert back into non running mode once the event I've trained for has passed. I do still do a mile or so a couple of times a week with the dog, just to keep on top of things and if I have another charity 5k to run I'll probably go back into the later weeks of the course and re do them. It's always been manageable, although a bit of a slog in the heat of summer! I am now almost 61, so yes go for it! There's a good BBC couch25k app. www.bbc.co.uk/sport/get-inspired/43501261 I chose Laura to be my 'mentor' and shes always cheerful and supportive, despite me swearing at her occasionally! Good luck.