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While the razor has been in existence since before the Bronze Age ( the oldest razor-like object has been dated to 18,000 BC ) , the most common types of razors in current usage are the safety razor and the electric razor , though other kinds are still in use .
 Bronze Age
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Bronze Age