Sea lions have a gestation period of 8-11 months. They will give birth and breed again within the course of a few months. It would be most accurate to say that sea lion pregnancy lasts for about 12 months.
The process of reporting possible signs of dementia within agreed ways of workings usually works like this - a physician would receive a patient and view his symptoms - he would check for his memory capabilities and his decision-making style. If he would see that the patient exhibits certain memory deficits, this would probably warrant further investigation whichcould lead to a dementia diagnosis.