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

What is the relationship between these matchstick pictures below?

I shave every day, but my beard stays the same. What am I?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

Can you find the missing piece of the Porsche?

Can you find the hidden animal in the picture below?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?

I add 5 to 9 and get 2. The answer is correct, so what am I?