A man dies of old age on his 25 birthday. How is this possible?

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Before Mount Everest was discovered, what was the highest mountain in the world?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

How far can you walk into the woods?

Who is that with a neck and no head, two arms and no hands? What is it?

Spot the cat in the picture below

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?