Chris- Right now there isn't a way to change the ages that appear by default when you select "New Search". Right now it's based on a percentage of your age.
Dave- The saved search called "Default Search" is actually not related to the criteria that appears by default in a new search. When the new matching system was introduced, everyone's old match criteria was moved to the Saved Search page and named "Default Search".
Michael- Excellent suggestion. I'm going to bring it up to our tech team.
Wendy- You are correct. The criteria that currently appears by default does differ between men and women. Since most women tend to show interest in men slightly older and most men tend to show interest in women slightly younger, the default age goes slightly higher for women and slightly lower for men.