My mom is up in her 70s and with age constipation as the digestive tract dries
out a bit. I want to put in a taller toilet bowl, so that she sits up higher,
that it will assist in crapping process.

I would like to get one that flushes a full 5 gallons and that is handicapped
heighth. What am I looking for, 18 inches? Will I have to buy this used or do
they make decent toilets any longer?