Martin Colbert Age Differences in Rendezvousing: 18-30s Vs. 31-45s. 91-100 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3101&spage=91 2004 conf/apchi/2004 APCHI db/conf/apchi/apchi2004.html#Colbert04