Parents to invest a lot in their child's financially can't expect to earn back there investment later in life when their children are able to comfortably support them in old age

answer: the first option is not an affect of aging. so the first option is the answer. (secondary sex characteristics appear)

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.