Poppagator,

you have a good memory.

(1) easy: Of course, Mark Spitz is right for the first easy question.
(4) easy: The Winter Games only started some decades after the Summer games, so it has to be a summer gold.
(3) difficult: It is even more memorable than you think, for the WWII came in between the wins. The guy was 22 when he went to his first Olympics (1932) and came back with a gold. He was 50 when he went to his last Olympics (1960) and came back with a gold for 6 uninterrupted (except by the war) golds (your guess how many golds he would have taken without missing the 1940 and 1944 Olympics). You have not guessed his sport yet. You have to be very quick (in one sense of the word) in that sport.
(4) diffucult: The idea with the Winter games is good (no real competition from Africa, Asia, South America, Southern Island), but you have no yet mentioned the country.
(7) difficult: I hadn't thought of her at all. You remembering 'Bonnie' made me recollect 'Blair'. She is not the response (for she never won a summer medal though she did some good cycling) but you have hit the combination of the two sports (cycling, speed skating).
(11) You are _very_ close (but India was/is brilliant in (field) hockey)

Wolfgang