You are assuming that the positive reviews are from older people? Then you go on to make assumptions as to why they are happier? Seriously this is a thread about nothing but your assumptions.
What do you consider to be old? I don't see anyone over 65 so you could say that none of my reviews are written by 'old codgers' which kind of blows your theory out of the water
P.s I'm not saying anyone over the age of 65 is an old codger, just confirming that anyone under the age of 65 definitely is NOT an old codger.