Agree with this observation of age factor. In the latest edition of Common stocks and uncommon profits by philip fisher, his son has described how at advanced age , Philip Fisher suffered from dementia and towards the end of his life, how this affected his portfolio. Offcourse we dont know for sure, in current times, how Warren buffet or Charlie would be picking stocks or if they have delegated it to their trusted assistants. But as age increases, brain starts decaying and it will have obvious impact on sharpness as well as critical analysis.
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