The first purpose of this study was to confirm that the trust of middle and upper-middle aged people was higher than young people. The second purpose was to examine the relationships between trust and the higher brain function, and the satisfaction for the interpersonal relationship. Participants in the elder group were 304 middle and upper-middle people who were living in a rural community, and the participants in the younger group were 270 college students. The result indicated the trust for message of the other was higher in the elder group than younger group. In the elder group, it was found that the higher trust for the message of the other was, the higher the performance of Stroop task, D-CAT, and the letter and verbal fluency tests were. Furthermore, the more the participants were satisfied about the interpersonal relationship, the higher trust for the message of the other was. However, it was not indicated that the correlation between the trust and the satisfaction for support by friend.
