1. the time by which something must be finished, submitted, etc. 2. (formerly) a boundary around a military prison beyond which a prisoner could not venture without risk of being shot by the guards.
While it's important to talk with your doctor about the cause of your slurred speech, slurred speech caused by anxiety is not dangerous. It's not a sign that you have something else coming, or that your brain will somehow be inefficient for handling life tasks in the future.
A common cause of voice disorders in seniors is esophageal reflux. This is caused by stomach acid backing up into the throat and spilling over to irritate the vocal cords. Although gastric reflux usually causes symptoms like heartburn, choking or difficulty swallowing, in some cases hoarseness is the only symptom.