What begins with T, ends with T, and has T in it?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

I cannot talk, but I always reply when spoken to. What am I?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Name a key which is hardest to turn.

Why is 6 afraid of 7?

who is silent in the parliament?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?