Mother sleeping more, about 14 hours a day, then naps also. Is this normal at 90 or is it a sign of depression?

My mother is 90 and does not sleep all the time. (Far from it. I need to ask for rest breaks when we are out shopping!)

Extreme fatigue could be caused by a number of issues- medication, thyroid, anemia. I would get her a full check up from a geriatrician. Don't let the doctors blow you off. If they try, say "What else could be causing the fatigue besides her age?"

Dad turned 91 yesterday. He does not have dementia. He sleeps from 7 pm to 6 am, naps from 9:30-11:30, has lunch, naps from 1-3, and is up until 7. Some days it is more or less napping. We do not worry about it.

A doctor once told me "sometimes they just get tired". His comment still infuriates me because I went there seeking answers, his comment was a glib and dismissive one based on her age and nothing more, he didn't know my mother at all. The thing is there is sometimes truth in what he said, but I don't know your mother well enough to know if this is part of a continuing pattern of decline or something new and worrisome that needs investigating.