What's the difference between vintage and old?

I have some clothes from high school (over a decade ago) that I like to joke are “vintage J Crew” or “Vintage Gap.” In stores that call themselves vintage clothing shops, I often see clothes that just seem plain old. I have leather sandals from the 60’s that my mom gave me… are they vintage?

Is there a standard period of time that has to pass before something becomes vintage rather than just old? Does it depend on the designer or label?

writing “vintage” this many times has made it stop looking like a real word.