It would be useful to filter for age and not just date of birth. If you want to target people in a specific age range and have a filter saved based on date of birth, it would be great for people to drop out of or be added to that filter when they age into out out of the criteria. As time goes on, the person ages, so an age range filter would reflect that, while a date of birth filter doesn't.
This is something we will consider but does not have a timeline at the moment.
However we are paying close attention to the most popular suggestions so please share and encourage others to follow and comment!