They do not look like 'antique' (ie 20s or 30s) fabrics, so I don't see any reason not to combine them with current ones. I've used fabrics of similar age without any problems. The only one I had problems with from the 70s/80s era or slightly older was some corduroy that had gotten dry rot from being stored in a basement for several years. I'm currently collecting fabrics to mix with some 60s/70s bright aqua, hot pink, knock out orange prints for a retro quilt.