Nail a sexy masculine look with a quiff and a patchy short stubble beard. Undercut side part hairstyles for older men. Web of them, the ponytail hairstyle is both classic and modern and gives aged men a unique style to flaunt. Although usually considered to be a youngster look, the undercut side part can perfectly suit any man over the age of. If you have straight hair, this hairstyle adds more definition and.