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

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

Next Number in the Series,

5, 16, 49, 104, ?

I know a nine-letter word having only one vowel.
Do you ?

Which letter of the alphabet has the most water?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

I add 5 to 9 and get 2. The answer is correct, so what am I?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

What goes up but never comes down?