Claim: Brain health can improve even in your 80s and 90s

The claim that brain health can improve even in your 80s and 90s is mostly true. Research from reputable sources like Harvard Health and the National Institute on Aging supports the idea that cognitive abilities can be retained or even enhanced through lifestyle factors such as exercise and mental engagement. However, some experts caution that while improvements are possible, they may not be universal and can vary significantly among individuals due to differing circumstances and interventions. This nuance is important to consider when evaluating the claim's validity. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (88%), while Gemini is lowest (50%). OpenAI expresses higher confidence than Gemini on this claim. While many sources support the idea that brain health can improve in older age, some experts emphasize that improvements are not guaranteed and can depend on the type of interventions used. For instance, while cognitive training can yield benefits, these may be limited to specific skills rather than general cognitive enhancement. This suggests that while the claim holds merit, it is not universally applicable to all older adults, indicating a degree of uncertainty in its absolute truthfulness.