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

2015 is upon us, meaning we're all a year older (but not necessarily wiser). Many of you are probably like me and are suffering a massive hangover from last nights festivities. 

Why do hangovers get worse as you age? Is this some sick form of revenge by our bodies for years of abuse? When I was younger I could drink significantly more and be perfectly fine the next morning.
gpt
Alcohol metabolism is a two-step process in the liver, where enzymes first break the alcohol down into acetaldehyde. Acetaldehyde is highly toxic – between 10 and 30 times more toxic than alcohol itself. The enzymes in your liver are next tasked with breaking down the acetaldehyde further, into a non-toxic substance called acetate. But your liver can only metabolize about one drink per hour – so if you’re drinking more quickly than that, not all of the acetaldehyde gets broken down. In that case, the acetaldehyde is released into the blood stream to wreak havoc around your body, resulting in the awful feelings associated with a hangover.

The liver capacity to cope with the toxicity of acetaldehyde decreases as we get older.  Acetaldehyde is directly detoxified in the liver by an antioxidant called glutathione. As age increases, glutathione generation capacity is decreased, so cells may not be recovered or repaired rapidly.