That driver's license you've held for so many years could be in jeopardy, if the DMV determines your driving skills need to be reexamined. Usually a reexamination comes as a result of someone reporting a physical or mental condition that you have or have developed or as a result of entries on your driving record.
Instances where others report that you driving skills may be compromised include:
Keeping a clean driving record decreases your chances of the DMV determining that you need a reexamination. Fighting tickets for speed violations and DUI that accumulate points can help.