Age isn't really important, although I get on better with younger people than older. I even get on well with my daughters teenage friends, they think I am great.
My ideal dream girl will be slim, non smoker, and does NOT want more children.
If she was in Australia now, that would be ideal, even on a temp visa, as, if we loved each other, then marriage would follow, and she could stay here. Simple.
She MUST be honest, and put the two of us above anyone else.
I may consider a lady with a small child, I need to think that through though, she would have to be really special.