Chinese? Green Turquoise Necklace on String With Sou Symbol

Recently bought this necklace. Looks like turquoise hand strung on cotton string. Has an unmarked box clasp with a Chinese Shou symbol. Measures 19" long when undone. Any idea on age? Maybe mid century?

 

It's Chinese turquoise for sure. The beads could have been reused, but it doesn't look like it. Age....you've got me.

 

Thanks, If I play around enough with google lens it tells me Chinese export, possibly mid century.