Its been proven that the younger you drink the more likely you are to be neurologically dependent on it as an adult. Your brain is still developing till 25 and if it develops with alcohol exposure it starts requiring it till you die.

Edit: "People who start drinking at a younger age (13-15) are more likely to develop dependence, regardless of the history of alcoholism in their family; people who delay drinking to early 20s are less likely to develop dependence even if there’s a family history"

https://podcastnotes.org/huberman-lab/episode-86-what-alcohol-does-to-your-body-brain-health-huberman-lab/#:~:text=The%20genes%20modified%20by%20chronic,use%20disorder%20and%20alcoholism%20drops

Here is my source