XXI

In Real world,
1. We live in the 21st century
2. The legal adult age in most countries - Alcohol, rent-a-car etc.

In mathematics
3. A Fibonacci Number
4. A Triangular Number
5. A star number
6. An octagonal number
7. composite Number
8. A Harshad Number
9. A Motzkin number

Symbolism/Religion
10. Number of the perfection by excellence, 3 x 7, according to the Bible.
11. 21 chapters in the Gospel of St John

In Science/Networking :)
12. FTP port number
13. Atomic Number of Scandium

In entertainment & Sports:
14. Used to be a TV show
15. 21 points are required to win a game of badminton and tennis
16. A card game, also known as blackjack
17. Name of favorite movie :)
18. Number of spots on a cubical dice

Trivia:
19. Number of shots fired in a salute of Royalty
History20. Number of demands sent to the Chinese by the Japanese in 1915

and finally.
21. That's how old I become today :)
Yep, Happy birthday to me! Thanks to everyone who has made the day special so far.
Cheers!
Amplebrain.