Does anyone knows what rating he had at age 12,13 and 14?

He played at the grandmaster level by 14/15

http://en.wikipedia.org/wiki/Garry_Kasparov#Early_career

I was wondering which one was the biggest mommas boy? In Gatas case---biggest poppas boy 

Maia Chiburdanidze mom was chaperoning her until she was 30 something.

Is something wrong with this picture?

hehe.

http://db.chessmetrics.com/CM2/PlayerProfile.asp?Params=199510SSSSS3S062926000000131000000000000010100

Performing above 2500 by age 12.

His first elo rating---when did he receive it and what was it?  Everything else is unnecessary.

Looks like 2595 1/1/80

http://www.magnuscarlsenchess.com/elo_rating_kasparov_carlsen_comparison.php

He talks about finally being given his elo by the Soviet authorities in his autobio. I'm not sure if they just withheld his reports till then or if some other mechanism was in effect.

Offhand I don't recall an internal rating being discussed. Maybe they were just assigned categories then?

My apologies Emperor-of-all-he-surveys, I will scourge myself immediately.

You gave us a page full of statistics but you can't answer a simple question---

His first elo rating---when did he receive it and what was it?

I do concur with this statement.

I think Prawny's approach was better.

 +1