"But when it came to choosing between the good and bad stocks, older people were significantly more likely to choose the bad one than younger people were. Before making a risky decision, all subjects showed increased activation in the nucleus accumbens, the same region that was activated by expecting a gain in the previous study. Now they were expecting the reward of a risky, but ultimately profitable, choice. But in older adults this pre-risk activity in the nucleus accumbens was much noisier, with more variability in its strength and timing."
I read the article and I'm not sure of the value - too many variables to pinpoint it to changes in the brain. As to the stocks it just could be older people put their money into companies they knew over the the decades but those companies were in declining industries. While younger people put their money into the new technology they use and in newer growth areas.
Sometimes death is not as tragic as not knowing how to live. This man knew how to live--and how to make others glad they were living. - Jack Benny at Nat King Cole's funeral