So strange about forty

This question got to me this morning and I am looking for someone to help unravel the answer . If you have time answer me 

Why Noah made the Ark in 40 days, why the rain/storm lasted for 40days, Why the Israelites walked through the desert for 40 years , Why the tower of barbel was built in 40 days, Why Jesus Christ fasted for 40days, and He ascended to heaven after 40 days. Why Easter is celebrated after 40 days. And they say Life begins at 40.  
Even Pass mark starts at 40. And they also say "A fool @ 40 is a fool forever". 
 What's so special about 40?
If you don't have an answer, please send to others we might get an answer.
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