I am 80 years old. for last several days have
Worthwhile to see a doctor..
Based on this description, you may be dealing with pose nasal treat with sinus inflammation. The cause may be allergic or viral infection It would be preferable to visit a doctor for evaluation and treatment to understand nature and severity of the problem and then it's treatment. In the meanwhile try saline nasal spray. It helps.
Hope this answered your query. Let me know if you need clarifications.