The second person writing is kind of fascinating, while also not being that useful. Although, I've recently been interacting with more people that do role-playing games and it's not seen as unusual in that group of people because of their almost constant reading of it. They have to be the only group where they read so much of it, unless there is a group of epistolary novel enthusiasts somewhere.
I haven't read Time and Again, but I love Replay by Ken Grimwood which I've heard is similar.
Voice is an elusive definition unless you stay somewhat vague, which everyone does. I agree that having a perspective on life and having life experience help with writing, although there have been great/successful writers in their teens and that seems to refute that premise.
I appreciate it John.
RE: Finding Your Voice as a Writer