If you are going to kill off any group in particular, it makes sense to eliminate those that society is not dependent on for continuance. Old people are not going to produce any more children themselves and are usually a net drain on resources (e.g. Social Security, Medicare).
This is not to say that there would not be some negative consequences for the family structure or other issues, but at least these people have lived long enough and are not going to be necessary for society to survive.
@FinalDresdonation I don't know that they are "secretly based" or not. Just stating the most plausible portions of the theory of population control. Based or not, it is obvious that people living longer means greater costs to keep them alive when the government has promised them money and the fact that old people vote more actively than any other group.
If they are secretly based, I can see a case of classic misdirection being the reason for the apparent gayness. They could just be gay though.
@houseoftolstoy My question is if they were secretly based then why are they so gay and trying to hold onto power