I think age is less of the problem and more religion, culture and tradition.
Your parents were raised to believe a certain standard, its probably what they have known all their lives. Your grand parents, whatever church they went to thought them that to be right with God, you must follow the teachings of God which is to be attracted to the opposite sex.
Lucky for them, they just happen to be attracted to the opposite sex, so they don't have a clue what its like to have same sex attractions and go through the negatives of living like an outcast with such feelings.
I have come to a conclusion in life, if they can't understand, just accept it like any other problem in life, taxes, death, why you are not rich etc.
The key is accepting yourself. You just happen to be born in that family. Still love them and respect them and hope that one day, they will understand and appreciate you for who you are. Just don't put your life on hold for it though.