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

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Make a sentence consisting of three words that have the whole alphabet.

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

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

Why Aeroplane windows are round?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?