Which trait among the Big Five typically decreases by age 30?

Jakob goes out a lot. He hangs around with a lot of guys from his neighborhood and his school. They are always skateboarding together downtown and playing video games

However, Jakob feels like he has no one to talk to about his problems and the things that are important to him. Jakob is experiencinga. social loneliness. b. emotional loneliness. c. separation. d. marginality.

According to the article For Better or Worse concerning marital satisfaction in middle aged adults, when a questionnaire has content validity it is:

(a) also reliable (b) easy to fake good (c) likely to be externally valid (d) likely to be confusing to answer