16655
and they tell us if a fifteen year old goes without oxygen for fifteen to twenty minutes , what results is usually severe and irreparable brain damage .
 a fifteen year old, fifteen to twenty minutes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 a fifteen year old, fifteen to twenty minutes