https://www.michaeljfox.org/foundati...e-motor-cohort
This foundation is looking for 10,000 people over 60 years old to do a smell survey. I think you can do it at this link online:
https://www.michaeljfox.org/get-invo...vey-screen.php
Apparently losing sense of smell is often a precursor to Parkinson's disease, so it is being studied. I'd love to do it, but I'm in my 50s.