[Agingcoder]

This is weird - my mother very rarely drinks but she’ll be hard pressed telling you exactly when was the last time time . This doesn’t make her an alcoholic.

Or should you start the rule with ‘you’ve been drinking everyday for a while’?

[machomaster]

If can't remember the last time she DID NOT take alcohol, it does make her an alcoholic. Or just an old person with severe memory issues, who shouldn't even live alone at that point.