Well it can't be much over 40years. American companies producing something of decent quality in China didn't really get up to speed untill the mid 80s. Assuming from the font that states China is say mid to late 90s. Altough thats when the mold would be made could be well into the 2000s

Thats what I meant with globaly/worldwide thats correct.

Globally thats hard to argue with. Thats impossible to measure accurately tough. Locally that might not be the case. In my country the number of people older then me is still rising slowly. Refugees so yeah