age
aging
aging society
block
circle
class
community
competition
conflict
difference
differential
economic
female
gap
group
income
inequality
lower
male
man
men
miniature
old
people
person
poor
population
poverty
power
pyramid
rank
rich
round
sitting
social
social stratification
spherical
stratification
stratum
structure
three
unequal
unfair
upper
wealth
woman
women
wooden