I will be 48 years old this year, and my allocation is 24% G fund, 10% F fund, 37% C fund, 11% S fund and 18% I fund.
It was based on one of the couch potato funds with a little tweaking.
I should probably go a little higher in my stock allocation, but I also have some ambivalence to doing that as well (I'm a little risk averse, so would prefer to have lower % of stocks but not change things during a downturn).