Can you tell the age on these heishi beads?

I’ve been wanting some heishi for a long time but they’re pretty pricey. I saw these beads for $20 and I thought that re-stringing them myself was the perfect opportunity to own some. I have spare cone tips and bench beads, but is anyone able to tell the age of the beads without any findings attached? I would like to use age- appropriate beads and cone tips.

These are nice. Turquoise heishi is always something good to own. They don’t have the look of old ones, I would think not older than the 1980s.