I've got UARS and my sense of smell disappeared as I left my teen years.

Poor smell is also linked to sleep-breathing disorders, which tend to get worse over time. The damage you accumulate from SBD cause most of the worst issues you can have - stroke, heart failure, dementia, diabetes, and many more.

I wonder why the study concluded that frailty is determined by your nose, rather than both having a shared root cause elsewhere.