Canadian monarchist here - my mother idolized Queen Elizabeth!
1. The Queen has said she'll never retire so that remark about age 95 and abdicating in favour of Charles...
2. Charles will be king. He actually seems to be more settled since his marriage to Camilla.
3. In the 30's yes King Edward had to give up his throne to marry an American divorcee. However the "rules" have changed. Charles will be king even with his divorce and remarriage to a divorcee. The Queen has really advanced the position and customs that the family follows.