I believe you want something like this:
type Person struct {
Name string `json:"name"`
Age int `json:"age"`
}
type Info map[string]Person
Then, after decoding this works:
fmt.Printf("%s: %d\n", info["bvu62fu6dq"].Name, info["bvu62fu6dq"].Age)
Full example: http://play.golang.org/p/FyH-cDp3Na