I have picked up an interest in doing a sprint triathlon initially, and maybe a full tri into the future.
The training, preparation and tactics interest me. I've done long-distance cycling and did reasonably well at it, and may get back into it. I am not particularly competitive, as in road racing, but time trialling also is another interest point for me. Triathlon holds an interest because it seems to be open to all sorts -- from those who just want to finish (like me), to those aiming for age category podiums, to those seeking outright honours.
I've never been much of a swimmer, but having joined a gym for a month in Vancouver has given me an opportunity to do much more swimming than I ever have, and to start refining my style. I am enjoying it immensely.
The cycling side will take care of itself, but the running is presenting its own issues, as discussed in Billydon's thread on running.
I know there are several 50+ participants in triathlons (and biathlons, presumable, and Iron Mans), so this seemed a good opportunity to get something going in the general part of the forum rather than the trainig and racing section.
I don't expect it to be overly active, but I'll keep an eye on it and revive it as I have questions, observations or reports to post. Hopefully others will do the same.