I went to visit my brother and my mom who live together 700 miles away from me in another state. The whole time I was there, all my mom wanted to do was sleep, day and night. I asked my brother if she's always like this and he said yes. But she wasn't like that the last time I visited which was about 6 months ago. She has no known medical issues, but she won't go see a doctor, and my brother won't push for her to go. He says "she's 79 years old, it's just old age, leave her alone." Is he right?