The Olympics is a young man and woman's game, some sports especially. Here's a histogram of the age distribution of the Olympians in the London 2012 games for all the athletes whose profile on the official website provided date of birth data. The ages shown are those for the 27th of July of 2012, the start of the games.
The mean or average age of an Olympian in 2012 was 26.5 years versus 25.8 years for the median. There's a significant long tail corresponding to older ages with a small proportion of Olympians over 40 years old.
We can break up the ages into male and female histograms. Here's the male only histogram:
The mean age was 27.0 years versus 26.2 years for the median.
Here's the female only histogram.
The mean age for females was 25.9 years which is smaller than for males. The median age for females, 25.4 was also smaller than for males.