Question: how often do you need to renew your id?
Answer: According to the DMV website it is 4 years for all Class D/E drivers licenses (unless you drive a truck, this is what you have). However, it does say that state ID cards expire every 6 years. If your mom has an actual license, it should be do for renewal every 4 years. If she has a state ID card, it's due every 6.