It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

When monkey rotate the gear, which mark will be hit 1 or 2 ?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

Which Travels Faster? Solve below famous picture riddle:

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

Below rebus represent famous DiCaprio movie. Can you name it?

I have an eye but still cannot see.

Who am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?