I would imagine 18 since you become an adult at 18. I suggest you find a glass blower to get information. This is an art not many do and you may be able to apprentice your self to one.
stained glass was first developed?
Lead, coloring, and glass/sand
green
A person working in glass in the middle ages was called a glazier. They didn't "paint" stain glass. Stain glass is a colored glass that is cut to fit a pattern.
They had glass in ancient times, and continued to make it in the Middle Ages. In fact, there was a glass makers guild in Italy that may have predated the Middle Ages. They used glass to make stained glass windows in churches. They also invented spectacles during the Middle Ages, and there are medieval pictures of people using them for reading.
Glass was certainly created in the medieval period, but it was definitely not invented then. The ancient Egyptians made a type of glass (faience) and the Romans got glass-making techniques from the Hellenistic culture. At the fall of the Roman Empire the manufacture of glass ceased in most of Europe, only to start again during the 12th century (in the middle ages).
The ages of being a preteen is 10-12
In the context of Scottish cattle farming, a buffer lass is typically between the ages of 16 and 26. This role involves working with cattle and assisting with various tasks on the farm.
Stained Glass Has been around since the early middle ages.
You will find nurses of all ages. Typically, from their early twenties (because of training required) to well in their sixties.
The ages of the werewolves in Twilight are ages 13-23. Seth Clearwater being the 13 year old and Sam Urley being the 23 year old. The ages of the werewolves in Twilight are ages 13-23. Seth Clearwater being the 13 year old and Sam Urley being the 23 year old.
An old fashioned word for wine glass is a chalice. A chalice was a common word during the middle ages.