Too many people, especially older people, are prescribed drugs that they may not need, or that may mix badly with others drugs they are prescribed.
Correlation studies are not about causation - they only indicate that things "seem" related. In this study, the relation was between pills for anxiety and an increase in the risk of developing Alzheimer's disease.
Long-term use of pills for anxiety and sleep problems may be linked to Alzheimer's, research suggests.
A study of older Canadian adults found that past benzodiazepine use for three months or more was linked to an increased risk (up to 51%) of dementia.
I am not anti-medications for medical issues where they are needed, but I have known too many people over 65 being prescribed pills for too many issues that might have other solutions.