What is vintage?

In 1994 I was teaching at Quilt America! in Indianapolis and some of the "big shots" there were talking about vintage fabrics. I mentioned some 1950's fabrics that I had and they laughed at me and said those aren't vintage. Fast forward 14 years and now I hear people calling them vintage. What is their status? This is one of the pieces I have. It is 36" wide and I have 4 yards of it. I have a spool near it so you can see the size of the roses. I saw this little bunny in the back yard and wanted to ask him how I can become as quick as a bunny again.
My computer class went really well yesterday. I teach it at a sewing machine store. Most of the embroidery machines require the use of a computer to put new designs in the machine to stitch out. Some of the ladies who purchased these machines had never seen a computer before. Others had used them at work but didn't experiment beyond what they did on the job. I try to help them learn about all of the functions of the computer while teaching them to download designs, unzip them in some cases, and then how to get the designs to the machine. We also go over anti-virus, spy protection and other things. It makes me feel good to share my knowledge and help them to have more fun.