I found it, he was 10.
Go here and read 21 and 22 http://www.freerepublic.com/focus/f-bloggers/2801934/posts?page=21#21
Not so fast.
The available data points indicate Obama was 10 in 3 different years.
1969 Christmas season: The Scott Inoue 3rd Grade picture
http://joytiz.com/2009/obama-ten-year-old-third-grader/
1970 Obama mets mentor Frank Marshall Davis for first time - when he was TEN.
“While his mother was in Indonesia during part of his teenage years, Mr Obama lived with his white grandparents. Mrs Weatherly-Williams said that the poet was first introduced to the future Democratic presidential candidate in 1970 at the age of 10. “
1971 - if the timeline is correct this is the year Obama turns 10. On August 4, 1971.
Of course in 1969 and 1970 and most of 1971 Obama II was supposed to be in Indonesia. He returns to Hawaii only in October of 1971.