Answer:
The 1st pyramid is Old
The 2nd pyramid is Young
The 3rd pyramid is Stable
Step-by-step explanation:
The amount of young people and old people in pyramid 3 are about equal (it doesn't have to be exactly equal)
There are far more young people than old people in pyramid 2, making in young.
There are more old and middle-aged people in the first pyramid, making it old.