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

What is the word or phrase?

A generous owner of a company decided to give a bonus of $45 to every man and $60 to every woman on his birthday. But only one-ninth of the men and one-twelfth of the women were present to take the bonus.

Can you calculate the amount of money the owner spent if there were 3552 employees?

There are forty elephants and they have forty-fore heads. How can this be possible?

Find the number of squares in the below picture

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.