These are 2,5 years old as well and eventhough quite small they are very adult-like looking. They have finished the leaf change and after I watered them they've doubled in size within a week. That's the spirit!
The color fades throughout the year but at the moment they are nicely red and with time, when they start to flower, a red selection would be possible. Yet again I have to note how grateful Lithops bromfieldii are.