Este sería tu código entre el rango de [$ageini...$agefin]
Código PHP:
if (($_POST[ageini]<>"") and ($_POST[agefin]<>"")){
$ageini=date("Y")-$_POST[ageini];
$agefin=date("Y")-$_POST[agefin];
$sql=select * from recruiters left join prereg_talents on recruiters.id=prereg_talents.recruiter_id where gender=1 and (`birth_date` >= '$ageini' AND `birth_date`<= '$agefin')";
}
Saludos.
David
