Age of 30 today. 31 at matriculation. What schools to aim?

Well 30, 31 is a totally "normal" age, even if it is a bit on the older side of things. Meaning that it won't make things impossible at any school. Yes, some schools do prefer younger students, and yes European schools are more flexible in their age range than American schools. Why? Well I figure is that the schools want someone with just enough experience that they can contribute and get a great deal out of the program, yet they want you to be young enough to "propel you forward" because they know and believe that most "shooting stars" start off young, and if they can help through their program, all the better. But it all has to do with how you present your "Readiness" to the AdCom, how you prove to them that NOW is REALLY the right moment for you.

As for which schools, with a 730 you can target anywhere. Are you planning on staying in tech and do you want a school with strengths there? Then you can look at Stanford, ( a long shot... Stanford does seem to favor the younger students) Haas, Sloan, Columbia, Tepper, Anderson, Oxford, Austin... but there are also plenty of "General Management Schools" which can get you what you want as well.