Geez, look at Betty in that splash panel. If Archie was a real teenager, he'd have her up in his room before the dust settled.
But the three of them are trapped in a timeless purgatory where no progress is ever made and nothing is ever settled. I've always thought that if Archie or Betty or Veronica ever got an inkling that they've been playing musical heartbreak since the 1940s, never getting older or wiser, it would be a horrifying revelation worthy of an EC story.