The purpose of filters is to let you decide whose Chat / Messages you want to view in your inbox.
You can set filters on age and current relationship status (marital status). All Chat / Messages from members who do not meet your desired criteria will not be delivered to you(i,e will be filtered in contacting them). You can manage / change your filters as often as you want from the My Profile > My Filters page.
Example: If you set an age filter above 50, then all Waves / Messages from members who are above 50 will be delivered with the filtered warning in your filtered inbox. Waves / Messages from members age Below 50 will go into your inbox without any caution. The same would apply to current status as well.