Does anyone know what kind of plant this is? Note that it will most likely bloom, something I've never seen it do, and I've had it for many years!
Well, that's such a coincidence - this is the second question on this particular plant today. It's Sansevieria cylindrica - confirmation of ID can be achieved once the flowers are fully out. Your specimen is getting enough light and is growing well - this particular variety of Sansevieria does appreciate much brighter daylight than other varieties, and it flowers more readily than other varieties too.