A) Past research has uncovered the fact that cognitive age is inversely related to life satisfaction among the elderly.
B) A person may feel young or old irrespective of chronological age.
C) That is, the 'younger' an elderly person feels; the more likely she or he is to be satisfied with life in general.
D) Cognitive age is a psychological construct that refers to one's subjective assessment of one's age.
BDAC
D introduces the concept of cognitive age which is followed up in A. Hence DA is the link. From this all options except option (a) can be eliminated. To verify if the remaining sentences make logical sense, we can see that C is elaborating on the inverse relationship that is given in A. B becomes the introductory sentence.
Hence, the correct sequence is BDAC.