People don't usually marry for wildly different ages, so what about age brackets? 34m of the total population is 2.5%, but what is 34m as a percentage of the p

People don't usually marry for wildly different ages, so what about age brackets? 34m of the total population is 2.5%, but what is 34m as a percentage of the population between, say, 15yrs and 30yrs?