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

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

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

What has one letter and starts with an E?

Different lights make me strange by changing me into different sizes. What am I?