I see what you're saying, and technically this will be skewed anyway as it's an 18 game and I would say (at the risk of being shot down) not a title to 'attract' younger gamers like other 18 games (CoD and GTA). So maybe (and this is a total guess) the PS4 owners are potentially older gamers (do we have any data on the age groups by console)?
At the scale it's selling, the PS4 demographic is almost certainly the broadest. I had reason to believe last gen that PS3 owners skewed older due to PS3 SKUs having a higher percentage of sales of multiplatform releases in genres and franchises that were popular in the prior gen. It reinforced the expectation that PS3 owners would skew older due to the higher initial price.