This one, for example: pmc.ncbi.nlm.nih.gov/articles/PMC4654709/

Or this one: pubmed.ncbi.nlm.nih.gov/22197939/

Originally, I had read a cluster of those articles some years ago, but scientific articles like to hide behind paywalls nowadays.

And at old age, it ends like this: www.npr.org/…/why-taste-buds-dull-as-we-age