Just after hitting 40 I moved from being a dev to being a tester/QA I was working at a small company and after almost 20 years there was getting bored - the tech was changing ( from BCPL on a PDP-11 to C and .Net on Macs/PCs ) but I felt stuck in a rut and found I was better at finding bugs than writing them...

Got involved with the test community, learned a lot, got myself known and then ended up moving from the UK to Michigan just before I hit 50 to work for a small but growing s/w consultancy