why do girls get more grumpy with a period than women?

Question: why do girls get more grumpy with a period than women?
- Keywords:
  girl,
  grumpy,
  period,
  women
Asked by AstonMartinDB9 to Iroise on 10 Nov 2016.
- Iroise Dumontheil answered on 10 Nov 2016:
  
  I don’t know whether that’s a fact, but hormones in teenagers are different than in adult women, and women may have had more time to get used to the feeling/learn how to deal with it using various strategies (e.g. distracting themselves)

Question: why do girls get more grumpy with a period than women?