Believe it or not, there are still users here who are under 20 years old...but in 5 years from now, do you still think there will be users here on Gamefaqs who are under 20?.
Like Canada's aging population, the average age also increases as each year goes by...so i'm confident that everyone on this site will be an ADULT in 5 years from now and all the high school kids will be gone :o
Since, judging by the level of maturity on the boards, the current average age is eight or less, then even with no new users, the average age in 5 years might make it to middle school.