I will add myself to this list. I am 43 and have just put in for PhD programs in Marine Ecology. I have a BS in Zoology from 20 years ago and a BS in Business.
I have been, and continue to, work as an analytical chemist in industry. I am trying to go back and do what I should have done in the first place and pursue what I am passionate about. I have a wife and three kids. Fortunately my wife and I both make a decent salary, and she can likely support the family in a halfway decent manner while I support myself throught school. I really have no idea if my prospects are any good - I only applied to four schools that would be within ~3hours drive of where my wife has a job opportunity and I put the applications together at the last minute.
Still, I am clinging to hope, and if it doesn't work out this round I am going to see if I can learn why not and cast a wider net next year.