In women's fiction, what is chick lit? And what's different between it and romance?.

Chick lit is a genre to describe novels written by women in their 20s and 30s about their work an emotional lives. Why can't women who are north of 40 and 50 still be considered chick lit writers who write about their work-life an emotional life as women, wives, girlfriends, mothers, and Friends. We're talking about what makes TeleCheck lit a fun and relevant genre from women who want to express themselves and be read by women who are their peers.