Answer: Death of loved ones
Step-by-step explanation:
This relates to research done under Human services which shows that as adults grow older, they will face a host of health problems and physical limitations but these can be managed because they are expected. There are drugs for the health problems and exercises for the physical ones.
Something that adults cannot be adequately prepared for however, is the death of their loved ones as they get older and closer to death. They will lose family members, friends and spouses and the psychological burden of this is not something that they can be prepared for, neither can it be minimized.