It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What do you think with the below Picture ?

Spot what is wrong here in below Picture?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Count the number of triangles in the picture below:

How could a baby fall out of a twenty-story building onto the ground and live?

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 ?

Decode this picture on T-Shirt and tell what it says ?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?