If you have ever had a life-threatening allergic reation, be sure to tell your anesthesia provider this fact. Anesthesia providers commonly treat the much more common early stages of allergic reactions to antibiotics, latex, and other substances so that the reaction does not result in any lasting harm.
needs to be still during the procedure.
Your questions about the possible after-effects of general anesthesia can be answered by the anesthesiologist. In general, the older the patient, the more medical problems they have (high blood pressure, diabetes, etc.), the more risk there is for after-effects from a general anesthesia. Older patients can have several days of depressed mental acuity after a general anesthetic, which is why he will be advised not to drive for at least 24 hours after an anesthetic, and maybe longer if he is required to take new medications (like pain relievers) after the anesthetic.