d0bd6e4e__NQDCs____Fidelity_Investments__401_k_
[Feature] Must start taking out money at age 70½ [NQDC] No IRC requirements, but plan rules are possible [401(k)] 
Yes, by IRC mandate, unless still working at company where the 401(k) plan is, subject to 5% owner rule
Nonqualified Deferred Compensation Plans (NQDCs) - Fidelity Investments