A．is curious about how old exactly is "old" for every people
B．is doubtful on any division made between "old" and "young"
C．is for the opinion that age and health are closely connected
D．is against the idea that age is connected with the state of mind

A．The concept of "old" is differently defined in different times.
B．Nobody can remain physically healthy throughout the life.
C．The progress in medical knowledge has contributed a lot lo longer lives of us.
D．Older people may get ill and physically disabled more easily than younger ones.