Interesting, I think that is the first time I've heard someone think the 60's are laid back compared to their little brothers and sisters. In the years I owned 60's, and the many auditions I held at the plex, most people felt my 60's were actualy a bit forward.
Now the 60's to 80's, I can see where someone would experience a bit more in those areas you mention.
Music style, room acoustics, placement, personal taste, etc... all have to do with the end result.