system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What causes the "had a hard life" facial features?

I see people that aren't underweight, and in fact quite fat, but there is a pattern to people who have had a history of heavy alcohol and drug abuse where their faces all sort of look the same, sort of hard to describe.  what's going on here?
gpt
To me the "hard life" type of appearance is related to droopy skin and wrinkles leading someone to appear older than they are. A lot of drugs out there dehydrate you and when you are dehydrated your skin becomes more dry and more likely to wrinkle, Vitamin A is important for your cells to turnover and alcohol prevents your body from using the vitamin A it receives. Hair might also be part of the "hard life" look you are talking about, the hair reacts to drugs in a very similar way in terms of hydration, hair that isn't hydrated it becomes weaker and more brittle.