There is a Fox doctor who is on every weekend on Fox and he is promoting drinking coffee to all ages. His conclusions are upheld in the studies you posted. Here is some of those conclusions based on intensive wide population research. Older people need to drink coffee, and I do - two to four to six cups a day. Consider the rest in quotes:
The most recent meta-analyses on neurological disorders found that coffee intake was associated with lower risks of Parkinson’s disease, lower cognitive decline and a potential protective effect against Alzheimer’s disease (but certainly no harm).
A systematic review published in 2005 found that regular coffee consumption was associated with a significantly reduced risk of developing Type 2 diabetes, with the lowest relative risks (about a third reduction) seen in those who drank at least six or seven cups a day. The latest study, published in 2014, used updated data and included 28 studies and more than 1.1 million participants. Again, the more coffee you drank, the less likely you were to have diabetes. This included both caffeinated and decaffeinated coffee.
Is coffee associated with the risk of death from all causes? There have been two meta-analyses published within the last year or so. The first reviewed 20 studies, including almost a million people, and the second included 17 studies containing more than a million people. Both found that drinking coffee was associated with a significantly reduced chance of death. I can’t think of any other product that has this much positive epidemiologic evidence going for it.