What does this rebus riddle means ?

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

Replace The Question Mark Below With the Correct Number.

2 {38} 3
4 {1524} 5
6 {3548} 7
8 {????} 9

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

There is something which you can be arrested for attempting but not for successfully completing.

Who are the happiest people in IPL match?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?