24 last year

No doubt :) However, as mid-life crisis responses go, it has considerable health and financial advantages over other well known responses (e.g., Corvettes, divorcing the first wife to marry a 20-something trophy wife, etc.).

I decided to do it after having a whole year where I could barely do anything do to some health problems. Once I had my health back, I just HAD to go and do something, in this case the triathlon, that I had always said I would do, but was too lazy to try before I became ill.