Life was different then. The post birth-control generation cannot imagine people not humping before marriage. I read yesterday that Mariah Carey and Nick Cannon actually waited to be married before doin' it, even though she had been married before. They wanted to be parents and wanted a strong relationship and a romantic ideal, maybe.
Looked up the von Trapps. He was 24 years older. Not much more than the 21-year age span between Mick and L'Wren. The von Trapps were 20 and 44 when they married.