"Women are girls."
It means If we are referring to other people means except who is/are talking then we should use "sont" and if we are referring including who is/are talking then we sould use "sommes" Right? Correct me if I am wrong..
Yes, in other words :
If I say: - nous sommes = we are (I am part of this group) - ils/elles sont = they are (I am not part of this group)
Strictly, women are adult, while girls are young or infant. Then women are not girls. Perhaps it is a special case. I don't quite understand.
I don't think this sentence is meaningful. Maybe it's there just for learning grammar using our limited vocabulary (so far).
how is "women are girls"this "Les femmes sont des filles" there is no "the" in women are girls
This is a case of generality, meaning that, in general women are... In that case, the French use definite article "le/la/les"
"les femmes sont les filles", i.e, "The women are the girls" is also accepted.
You got it, yes. Actually, provided learners' level would be sufficient, we would rather use "women used to be girls", which would make sense. (les femmes ont été des filles).