Critical Reasoning (CR) | Re: UCLA Sociologist: Between 1962 and 2012

The logic in this question is very hard to understand. If average age of marriage is increasing- that would mean that the women are getting married, just at a later age? So if the women who were once getting married at 16 are now getting married at 35, (ie same pool of women/#/etc), how is that decreasing the marriage rate, which is defined as over 16?

So for example: Let's say average marriage age increased from 16 to 35. In a particular year, you have a "batch" of 16 year olds who