What has one letter and starts with an E?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

The dirtier I get, the whiter I look. Who am I?

What jumps when it walks and sits when it stands?

I don't get anymore wetter, no matter how much rain falls on me.