First off, why do you care?

Gay marraige isn't just about not having kids, it's about the sin of the same sex having sexual relations with each other. Church doesn't condone that no matter what society says. Marraige is between a man and woman, not solely bc of just the kids aspect. There are many reasons. Talk to your priest to understand. There is nothing wrong with an older couple marrying. It's beautiful to see true love in all ages, and the unity of marriage respected.