Age-. The general rule in the industry is that once an A/C unit reaches 10-15 years, the idea of replacing the unit is usually a much better investment than putting money into an older system. If your system is at this threshold, it's usually wise to begin expecting, not wondering, when the system will fail.
You can keep the money in the TSP after you leave your federal job to benefit from the low fees, or you can roll over the money into an IRA or a new employer's 401(k), 403(b) or 457.
A rollover is a distribution from a retirement plan that is contributed directly to another qualified retirement plan or IRA. If you rollover a distribution within 60 days of receiving it, the amount is generally NOT taxable. You generally cannot rollover required minimum distributions. Figuring the exact amount of your required minimum distributions can be complicated, but it is is equal to the account's balance as of the preceding year divided by a distribution period from the tables in Appendices B and C of Publication 590.