Answer:
age
Step-by-step explanation:
Age segmentation is basically a type of demographic segmentation where market are divided based on the age of the consumers.
I guess this question is a little old, because 40 year old Gen Yers are unlikely to be skateboarding at the mall. Their children might, but not them. I'm part of that segment (born from 1/1980 to 12/1993) and I cannot see myself or any of my classmates and friends doing it.
The question should be updated from generation Y to generation Z which includes basically younger people. I do not mean to offend anyone, some might still skateboard, but the same as with football, not because Tom Brady keeps playing it means that all NFL players are over 40.