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.
You can also download the helpful Rollover Pocket Guide for easy reference. Rolling over your 401k from a previous employer keeps you in control of your retirement plan and may give you more flexibility in how you invest. You can get up to $600 cash when you rollover your old 401k into a new TD Ameritrade account.