@Jack, the VTSAX doesn't really require any "managing," does it? I mean, I'm just letting it ride. As I said, if I later think that the retirement fund is a bit too conservative or whatever, I have the easy option to adding to it, but I don't consider that eliminating my plan's simplicity.
@Smokystache, I'll be 62 in 2035, and I think that's the right time for me to have a 50/50 stocks/bonds setup. I did it on purpose. My wife has a 2040 account (as she's a few years younger) so from my age 62-67, we'll still have that slightly more aggressive account.