Medium logic riddles for teens

Tall I am young, short I am old. While with life I glow, wind is my foe. What am I?

Tommy Tucker took two strings and tied two turtles to two tall trees. How many T’s in that?

What has a head and a tail, but no body?

I have a bed but I do not sleep. I have a mouth but I don't eat. You hear me whisper, but I never talk. You can see me run, yet I never walk. What am I?

John Heysham Gibbon was most renowned surgeon of 1940-1970. More than 90% of his surgeries he performed are highly successful and still almost all of his patients die.

A girl was ten on her last birthday, and will be twelve on her next birthday. How is this possible?

How can a pants pocket be empty and still have something in it?

I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?

You have two cups. One cup is filled with black coffee and another cup is filled with black tea. Both cups are filled with equal quantity of respective beverages. Take one spoonful of black tea and mix with the cup of black coffee. Then take one spoonful of black coffee and mix it with the cup of black tea. Now tell, me which cup has more liquid in it? Does the cup of black tea has more liquid or black coffee has more liquid?

There is bomb on top of a computer; around the computer are a hairbrush, keys, phone and a cup. When the explosion comes, what item destroyed first?