“…The average age of these populations has been under 90 years. There are some studies on the oldest-old, which include the effect of social networks on cognitive function (Cherry et al, 2013;Cho, Martin, & Poon, 2014;Deng, Hu, Wu, Dong, & Wu, 2010), but few studies have focused only on the association between social networks, social contacts, and cognitive impairment in the individuals aged 90 years or older.…”