Also old age onset hydrocephaly. If you have an elder friend or relative with memory issues, urinary incontinence, and a shuffling gait - it’s worth checking out.
https://www.dementia.org/normal-pressure-hydrocephalus
http://www.aans.org/Patient%20Information/Conditions%20and%20Treatments/Adult%20Onset%20Hydrocephalus.aspx
Thank you