how old is an 1/2 oz container of heddy fabric mending adhesive?

I have a 1/2oz container of fabric mending adhesive in perfect condition how old would this be?
gillian taylor, March 2019


done
I think this an American product so the half ounce size doesn't give a clue on age as they still sell products in imperial amounts. If there is a web address on the packing its probably less than 15 years old. If there is a bar code on the pack it's less than 30 years old..

Rupert, March 2019