It is never too soon to begin planning for your retirement.  Check out these benefits calculators:

Thrift Savings Plan
The Thrift Savings Plan website includes calculators for estimating the growth of your TSP account, and for estimating the monthly annuity payments your account balance would provide.

Social Security 
Set up a mySocialSecurity account.
Online Calculators including Retirement Estimator, Retirement Age Calculator, Windfall Elimination Provision Calculator, Government Pension Offset Calculator, and more.

Determine the face value of your life insurance, how much you are paying, and how selecting different options would affect your payment.

Financial & Tax Planning