Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What is the riddle which can be asked all day with a different correct answer each time.

How far can you walk into the woods?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

What's a single-digit number with no value?

Can you find the key in the picture below?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?