Live Poll: Sister Acts - Movie and TV Sisterly Actress Combos

The dividing point just ended up where it did to split the poll evenly into two parts.
Which actual blood-related sister combination of classic* movie and television actresses is the most talented grouping? * oldest sister born before 1965

I don't think ancient or older would be any better. Classic is a far better word to use, plus these sister pairs are in their fifties or older and most had career peaks at least twenty-five years ago. Plus, to be considered a classic only requires a quarter century space of time. By definition, films from 1994 or earlier are consider worthy of classic status? Google: How old does a movie have to be to be a classic?
(Films have to be at least 25 years old to qualify for the National Film Registry)

Most younger movie-goers probably have no issue with the use of the term, but older movie-goers who share a generational bond with some of these sisters might take issue. I am open to an alternatives, retro is one possibility. ie Retro Movie and TV Actress Sister Acts

I don't think you need an adjective at all. The dividing point, as you describe it, was arbitrary and, besides, there's no need for an adjective. "Retro" seems just as inaccurate, but unfortunately also sounds a bit dismissive, so the alternative that seems to make most sense would be to just cut the adjective. The fact that the other poll has an adjective doesn't necessitate the use of one here.

I'm not sure what you mean by younger and agree that teenagers probably wouldn't care but if you mean younger than these actors, I am younger than the youngest ones  but I think it's important to be accurate. I'm probably more sensitive to it because I'm a writing instructor and precision is one of the three most essential elements of writing but I think non-writers would see the title and think actresses like Katherine Hepburn and Ingrid Bergman. Also, from a gender perspective, no one would call Brad Pitt, Keanu Reeves, or Christian Bale classic or retro so I think it's better to avoid any unintended offenses so my two cents would be no adjective. 

I think you need something to differentiate the two polls in title alone to understand how they were grouped for comparison. I dislike identical titles Sister Acts - Movie and TV Sisterly Actress Combos (no adjective) and adding part one or part two. Whereas the first one was called Modern Movie and TV Actress Sister Acts the second being called Retro Movie and TV Actress Sister Acts makes some sense. Plus, I doubt anyone would find the term offensive. I do like original unified title better, but it would be even longer and more cumbersome with a Part One or a Part Two dangling at the end. In the end, there seems to be merits and drawbacks with both approaches.

"Retro" is also a bit awkward because some of the pairs are very much current. If there's no better option, I think the polls would still be differentiated if one has "Modern" and the other does not.

Sister Acts - Movie and TV Sister Combos