Phht. there's other explanations.
these people were specifically chosen because their faces are more distinctive than the average, not too much, of course, but still, perhaps more 'memorable'…
Owen, as handsome as he is, is still of an 'average' set of facial features… softer, leet's say. Which tends to show age to a lesser degree.
Stronger, more distinct facial features will look 'older' and 'show' age more quickly…?
Also, we tend to think people (women especially) look 'younger' mainly because we are seeing pics of them on social media, and if they aren't run through filters, the person is selecting those with the best lighting, angle, cisumstances (smiles, etc) that flatters their appearence as much as possible… So we tend to hardly ever see them as they truly are, sometimes lookin pretty dang run-down! lol