Here is an update for StackOverflow statistics for the users with a reputation more than 300. The last measure was made in January 2013.
I almost stopped to answer from the beginning of 2014. At that time I had a reputation around 1600, now it’s 2630.
The number of users growed more than 3 times, but the distribution by reputation is mostly the same.
The same proportions of grow for France and Russia as for all users.
By age, there are more old people and I moved to the third category (35+), which growed up from 20% to 27%.