It is not surprising that there aren't a proportional number of old people in TV/movies right now. And I suspect there never were. TV/movie audience desire to view people who possess high-status markers. Two important markers are beauty and power. In reality, younger people typically have beauty but not much power. Older people have more power and less beauty. Since TV/movies don't have the constraints of reality, we can make young people who are beautiful also powerful. We can rarely make old people beautiful with some exceptions, which TV/movies often exploit. I don't think this has anything to do with respect.