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

Count the squares in the matchstick puzzle below?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

Can you find a five letter word that is left with only two letters if one is removed?

Only one colour, 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?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

What does this rebus riddle mean?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

The more you take me, the more you leave me behind.
Who Am I?