What age did you learn chess principles?

What age did you learn about principles like openings and you had to control the center and cool words like develop actually means puttings your pieces near the center and control actual means the squares a piece can go to and terms like Opposition and alot of the tactic terms

When did you stop playing like a kid only trying to keep material advantage and hope your opponent will blunder really badly  and learn the many weird words on the chess vocabulary?

6, when I learned about chess in general. I think I stopped playing like a kid as for your definition when I was 9-10.

6 

I was 6 when I learned chess but never joined a club, and only played for fun.

but I first learned the basic principles at the age of 30. I joined a chess club and a year later chess.com

I stopped playing like a kid at the age of 33. I learned not to  play hope chess.

I think how you explain principles is more basic how to play chess.

if I think of chess principles it is e.g  never move a piece more than once in the opening and something like : Don't pin the adverse King's Knight to the Queen before the opponent has castled

I still play like a kid!!

;)/

http://home.comcast.net/~danheisman/Articles/Dan_sayings.html

check these princibles from dan heisman =)