…begins to fade when dudes hit their late 20s. Faces tend to thicken a bit, especially if you’re partial to fatty foods and bending the elbow**. This is why a 30-year-old Paul Mescal can’t convincingly play a 21- or 22-year-old Paul McCartney.
In the below snap Mescal is wearing an early 1964 soup-bowl, no-sideburns Hard Day’s Night haircut. The early 20something illusion simply isn’t there.

** I distinctly recall being vaguely horrified by the slight but noticeable thickening of my own facial features when I hit 30. My Burger King diet and my nocturnal slurpings of Jack Daniels and ginger ale had taken their toll.