A crowd is defined as:

a. small groups of friends who share activities and confidences

b. large hoards of youths who share common locations like schools and neighborhoods

c. loosely organized groups of children who share interests and activities

d. small groups of friends who engage in crime and use drugs and alcohol

I believe the answer is: c. loosely organized groups of children who share interests and activities

But as the majority of people who gather for the same interest are younger people, older people often used the word 'crowd' to define the youngster's gathering. Overtime, the implication of the word 'children' in the definition start to dissapear