Since how many years the stretch ceiling is on the market ?

1969 Yes, since half-century!
Created by a famous French Company.
Actually the original name was the « French Ceiling.« 
Many designers today get back on his original appellation.
Stretched “French” ceilings were created to hide pipe, remedies at flaking paint and avoid to see cracks into concrete slab ceilings.
After decades Stretched Ceilings his is becoming more popular for his opportunity of real creativities and endless designs.