function set_ages(){
	var age_min_yr = (!document.getElementById("age_min_yr").value=="")?parseInt(document.getElementById("age_min_yr").value)*12:0;
	var age_min_mo = (!document.getElementById("age_min_mo").value=="")?parseInt(document.getElementById("age_min_mo").value):0;
	document.getElementById("age_min").value = age_min_yr + age_min_mo;
	
	var age_max_yr = (!document.getElementById("age_max_yr").value=="")?parseInt(document.getElementById("age_max_yr").value)*12:100;
	var age_max_mo = (!document.getElementById("age_max_mo").value=="")?parseInt(document.getElementById("age_max_mo").value):0;
	document.getElementById("age_max").value = age_max_yr + age_max_mo;
	return true;
}