About 14 years old seeing the original game TF Classic came out with all of them in it in 1999 but if your talking about when the were re created in 2007 then like 6 years, if your just talking about what there general age is, noone knows.
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yes, you can use props/characters from all games that are made by valve
It isn't said but thought to be in his 40-50's
Yes. TF2 is a GREAT game, and I recommend you "buy" it. TF2 is now free to Play.
No you cannot trade weapons for beta tf2 to normal tf2. Beta Tf2 is considered to be a completely different game by steam. Therefore the two game's inventories are not compatible.
Try lowering your graphics settings.