I think it would be better if you meet with this woman for coffee casually at first. I am going to disagree with other posters in that if I was 45 and single I might be taken back a bit if a 30 year old approached me right off the bat asking me to date him. I would not think he's crazy or anything but I would probably consider the age difference. However, if I met him for coffee casually and got to know him I may be able to see "him" first on a social level and then have a chance to think about it in a different way.
Ofcourse, that's just me and how I would feel about it.