You know how at a triathlon they mark you with your age and number? You didn't? Well, they take a thick black (or I've seen red too) felt marker or grease pen and write your race number on your arm and hand. The hand part is in case you're wearing a wetsuit. They also write your age on the back of your calf. This is so that people contending for an age group award will know their direct competitors.
The marking for a duathlon is the same. For the next few days, despite intense scrubbing, whenever I wear shorts it will be quite apparent how old I am. I'm just hoping it hasn't tanned into my leg!
My first duathlon went well. I'll have a race report up soon. Soon after I write it, that is.