what does the below math rebus puzzle mean?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Using Only Five 5's and any mathematical operator make sum as 37

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?

If two's company, and three's a crowd, then whats four and five ?

Who can jump higher than a Mountain?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

If eleven plus two equals one, what does nine plus five equal?