This just highlights how Superman has REALLY changed over time...and the culture surrounding him. For some perspective, the original Golden Age Superman would have been born slightly before 1920, when Charlie Chaplin was just becoming famous, when the culture and dress of the USA was still slightly Victorian, and when Civil War veterans were living in retirement. Jazz wasn't even popular yet.
By contrast, the last Superboy would have grown up in the 1950s. Rock and roll, leather jackets, and poodle skirts were popular (as was Ike), and he grew up watching the Adventures of Superman on TV.
The current, as-yet Superboy-less Superman was actually born after the opening of Superman: The Movie. He could have grown up wearing a bold cut, a rat tail, a mullet, or just 5 tons of hair spray. Maybe he knows every Michael Jackson dance move, loves Full House and the Fresh Prince of Bel-Air. Superman Robots? Bah, he's built several fully functional Johnny-5s, but hasn't quite broken the time barrier with a Delorean yet.