Board Thread:General Discussion/@comment-11398218-20140521105018/@comment-8986886-20150610145500

Coolishy777 wrote: She was adopted into the Kuchiki clan 40 years prior to the start of the series.

Not to be nitpicky, but it's actually 49 years prior to the start. Hisana died 50 years prior, while Rukia was found, and immediately adopted into the Kuchiki family the following year.