I find your situation interesting. Your W has a degree from a prestigious college. Is it a useful degree? Also, does she have good life skills? Could she be on her own, and make it? Or is she dependent on you for finances and for running a household in general?
Rushing into marriage ... I think a fair number of people who find themselves here have done that, including myself.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final