you you wrote:
Is it the average age? The vote is about a specific age.
Perhaps you don't know the definition of "average"?
av·er·age
ˈav(ə)rij/
1. a number expressing the central or typical value in a set of data, in particular the mode, median, or (most commonly) the mean, which is calculated by dividing the sum of the values in the set by their number.
So if 10 people "vote" for their age using :
2 x 21-30
3 x 31-40
4 x 41-50
1 x 51-60
To make the process easier, you'd simply make "21-30" = 25, "31-40" = 35, and so on.
So, (2x25)+(3x35)+(4x45)+(1x55) = 390
Divide that number by the 10 folks, would put the average age roughly at 39.
I don't know how math/English works in the "The centre of the universe" but at least you now know how it works here.
Good day.