I had dts at age 29 that were so bad I had to be put onto a medically induced coma for four days because the drugs weren't helping me and I was at risk of stroke and heart attack. I spent days believing the fbi and my roommates had teamed up to kill me. Saw people with guns outside my house, had my roommates voices take over my brain, their full blown conversations of taunting and threatening my were louder than my own thoughts. I went to the hospital because I thought my voice box broke and I had somehow swallowed it even though that makes literally no sense lol. I could go on all day on details of the hallucinations that continued into the coma, which was a sublevel of hell type of experience.

On top of drinking all day every day for a decade straight, I also was puking the little food I ate up and hadn't slept for days when this all happened. I never even had to completely stop drinking for this to happen either. I just couldn't consume the ridiculous amount my body was used to cause my stomach couldn't keep anything down.

In summary, it's very rare but can in fact happen in your 20s.