I am now starting to wonder if my target fund dates are off since I'll be 72 when these funds hit here target date. Should I let them ride out or convert all to something that matures when I'm 60?
Personally, I find it more helpful to think about the asset allocation of these "target date" funds, instead of the actual date. Yes, the asset allocation will change over time to be more conservative, but you want to have the "right" mix as a starting point today.
You will find that many people on the MMM boards prefer an asset allocation of 80% stocks, 20% bonds, or even riskier. Your target date 2055 is probably at or near this mix, which is usually appropriate for your age. This risk profile means the balance of your Roth will swing, maybe by a lot. You could lose 30% of your investments in a bad year. If this doesn't bother you, since you figure you aren't touching the money for decades, then you are already in the right place!
But if a 30% drop will make you do something rash, like sell all of your investments, find something more conservative. A target date fund with a closer retirement target date would achieve this.
Good luck! I just recently got comfortable with investing. We are the same age. I have found the Dough Roller podcasts to be very helpful. My advice above is pretty much taken directly from one of those podcasts.
Go slow. You don't need to change anything until you have done all your homework and you're really comfortable! That said, do keep actively thinking about it, since your fees on your existing PAROX investment are high.