Yes it does here is the definition:
Dark ages was a time during which a civilization undergoes a decline: such as. a Dark Ages plural : the European historical period from about a.d. 476 to about 1000 broadly : middle ages. b or Dark Age : the Greek historical period of three to four centuries from about 1100 b.c. —often plural.
Here is another definition:
The 'Dark Ages' were between the 5th and 14th centuries, lasting 900 years. The timeline falls between the fall of the Roman Empire and the Renaissance. It has been called the 'Dark Ages' because many suggest that this period saw little scientific and cultural advancement.
I hope that helps
