>>13214486Bad thing happens = brain goes slow like
>>13214579 said
Think about it, you become numb and feel nothing, you become indifferent to some amoutn of pain, and you can even destroy your social life because of how little you care. Why the HECK would that happen to a human being EVER?
>death of a relativeNot depression, but grief and fear of personal death.
>abuseIt's a mistake but not on your part. It's why it's called abuse. Your brain gets tricked into thinking it's your own fault. Our brains look for patterns, but with abuse nothing seems to make sense. The only thing in common is that it's related to you.
>being olderMost people don't get depressed, but it's related to the first bullet and the fear of death, as well as feeling like you waster your life/youth which is, or may be, a mistake.
You could also get a religious explanation, but the fedora tippers will get angry.