No, it's old-age setting in. It also makes you forget correct usage of the apostrophe. (I'm in an extra-pedantic mood this morning!).
Actually you're quite right. My particular gripe is Toffee Crisp. They used to be delicious!
....has lost it's distinctive taste
It also makes you forget correct usage of the apostrophe
You also have to factor in that as you get older, like everything else, your taste buds change/deteriorate.
Would you have eaten Mexican/Indian foods aged 5?
It is my kids that remind me of this when I wonder what they are talking about when they tell me something is spicey even though I cannot taste it.