ok reading through this thread more carefully makes me think you should make sure you know you want to risk telling her. you say you are are very good friends--what does that mean? if you're as close as you say you are, chances are she'll only see you in that platonic light. while i don't think the friendship would be fractured per se, the relationship would undoubtedly change.
but who knows. she may feel the same way. it's a risk vs. reward sort of thing, i guess. if it doesn't work out i would caution against falling for your older, close friends in the future.
but who knows. she may feel the same way. it's a risk vs. reward sort of thing, i guess. if it doesn't work out i would caution against falling for your older, close friends in the future.