Here's a pic of the Agave 'Blue Glow' Note the last pic. You'll get an idea of size better. The A. 'Blue Glow' is in the ground. It is about 1' tall and 8" wide. Compare it to size of the A. De-meteesia in the large red pot. (A. De-meteesia is huge)
Here's the tiny, tiny little plant I told you about. Not sure what it is called. It is 2 years old. Got in a BB store on the table where they keep all the tiny plants. Don't overlook the Aloe/Agave table either. It could be there with the larger ones.
Here's a bunch of Aloe vera. Just your generic ones. Mine are about 1-2' tall and as for wide...well they're about 1-2'. I have them planted together in a large group and let them go wild with the pups adding to the 'bush' of Aloes.
But you can keep just one individual plant as long as you keep removing the pups. Also if you have room on the floor in front of a bright sunny window you can put it in a larger pot. Eventually it will send up that lovely stalk of flowers that get about 4' tall and often multiple stocks of flowers on one plant..
Very pretty outside as well as they attract Humming Birds.
You can see all the pups you can remove from the plant if you want to. You can plant these in their own pots
Hope you like these suggestions.