1) I don't think that your age rules you out. But, someone at your age more often applies to a 1-year program or (even moreso) a part-time program. So, think about those, and be able to articulate your reasons for why you DON'T want to do one of those (if that's the case).
2) Job prospects aren't any worse for someone at your age. I think your maturity will help you in interviews more often than it will hurt you. Getting into a top school may be harder than landing a job once you're in.
3) Not sure what I can tell you here, other than the fact that you'll want to make sure that you come across as focused and clear on what you want to do career-wise, rather than looking like you keep changing your mind.
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