You can look at the UK study directly: paper. They explicitly mention that they are interested in “normative (i.e. non-pathological) age-related differences in cognition” and that they took pains to get a representative sample.
If you accept that their sample is representative, it does show major cognitive decline with age regardless of who got diagnosed with what. That decline is not subtle.
You can look at the UK study directly: paper. They explicitly mention that they are interested in “normative (i.e. non-pathological) age-related differences in cognition” and that they took pains to get a representative sample.
If you accept that their sample is representative, it does show major cognitive decline with age regardless of who got diagnosed with what. That decline is not subtle.