system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What makes hangovers get worse with age?

Even after only a couple of years.  At 18-20 I could drink a ton and wake up like nothing happened. Now at 24, I wake up and I don't feel like I am going to make it.
gpt
Alcohol is broken down in basically a two-step process: Alcohol (Ethanol) is converted to a molecule called Acetaldehyde, and then to more stable products (like acetic acid, acetyl-coA, water, CO2).

Acetaldehyde is highly unstable and can cause a lot of damage and inflammation to your body. As we age, our livers grow worse at breaking down acetaldehyde, and this is thought to play a part in why hangovers get worse as we get older.

There's still a lot of debate as to what actually causes hangovers, however, so this is only a partial answer.