I don't know, but could it be related to the older golden boy and golden girl, a successful man and woman, respectively? Quotes from the OED, 2nd edition:
1937 C. Odets (title) The *golden
boy. Ibid. iii. i. 196 He walks down
the street respected—the golden boy!
1964 ‘J. Welcome’ Hard to Handle viii.
91 Poor dear Richard.+ What a change
from being the golden boy of English
1965 P. Moyes Johnny under Ground xx.
250 That would have been the end of
Beau Guest, the young chevalier, the
1971 Sunday Times (Johannesburg) 28
Mar. 24/1 Ever since he assumed the
‘golden boy’ mantle, Richards has
studiously avoided local opposition.