Okay.
Smoking can impair taste sensation -- and quitting can improve the situation quickly!
And, aging may be associated with reduced taste sensation. So, if you are over age 65 and none of the conditions or explanations for loss of taste seem to apply to you, it's possible that your taste impairment is related to your age.
Now, here are the last questions.
At the time you noticed trouble with your ability to taste, did you start a new medication (such as a blood pressure medication or an antibiotic)? Or, did you have exposure to toxic fumes (such as paint solvent or formaldehyde)?