Relaxed and outgoing?  You may have a lower dementia risk.  Anxiety and isolation can damage the hippocampus, which then can lead to cognitive decline, research shows.
D001007:Anxiety / Q000473:pathology* / Q000523:psychology*; D003704:Dementia / Q000453:epidemiology / Q000473:pathology* / Q000523:psychology*; D006624:Hippocampus / Q000473:pathology*; D006801:Humans; D010551:Personality; D012307:Risk Factors; D012934:Social Isolation