Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

What do you call a fish without an eye?

Count the number of balls in picture below:

Consider this: Arnold Schwarzenegger has a big one. Michael J. Fox has a small one. Prince doesn’t have one. The Pope has one but never uses it. Bill Clinton has one and uses it all the time. What is it?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?