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.
If you move your assets from one investment to another, it's called a rollover. For example, if you move money from one IRA to another IRA, that transaction is a rollover. In the same vein, if you move money from a qualified retirement plan, such as a 401(k), into an IRA, you create a rollover IRA. Similarly, when a bond or certificate of deposit (CD) matures, you can roll over the assets into another bond or time deposit.