Your question is a good one. But first, I would ask you "When do you intend to retire" and "When do you intend to start withdrawing from your account".
I'm 52, retired for the last 3 years and have just started keeping my TSP primarily in L-Income fund to preserve my investments while making a modest income each month.
Like any of the funds offered by TSP, this all depends upon how much risk you can stomach. If you are close to retirement and have a sizeable balance, you would probably want to keep about 60%-70% in G fund. If you want to keep working and have other income streams available, you could get more aggressive with your TSP account.
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