What is the longest word in the dictionary?

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

There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
You are on one of the islands and meet three Islanders. You ask the first which island they are from in the most appropriate Polynesian tongue, and he indicates that the other two Islanders are from the same island. You ask the second Islander the same question, and he also indicates that the other two Islanders are from the same island.
Can you guess what the third Islander will answer to the same question?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

What demands an answer, but asks no questions

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H