Tirion Fordring's age has never been stated in any official lore, so it is unclear as to what his age would be.
World of Warcraft came out on November 23, 2004, which makes it almost 8 years old.
No. Blizzard does not delete accounts on World of Warcraft.
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C'thun is one, I believe. I am unsure of the others.
None. It's an answerless question: Jeffrey Kaplan did not invent World of Warcraft, he was a Lead Designer responsible design of dungeons, lands, quests and outdoor zones.
Warcraft, Orcs and Humans, was made in 1984, so it is 15 years old.
The old Warcraft directory was C:\games\Warcraft. This changes depending on which version (WC, WC2, WC3 and so on) as well as your operating system.
An "Old God". The last boss of the Ulduar raid instance in Storm Peaks.
You will still have access to your old characters when Cataclsym hits in December of 2010. They will not be deleted or anything like that.
World of Warcraft is rated T for Teens, so it should be fine for a 14 year old child to play. Of course, the child should be monitored, and the parental controls feature should be activated if the parents feel play time is getting out of control.
The license to fly in the old world (Flight Masters License) can be purchased from the regular flight trainers in Orgrimmar and Stormwind.
There is the alternate, World Of Warcraft and then there's the old Habbo-Hotel.