That's a nice looking succulent! I once had a shamrock that lasted years beyond it's 'best before' date; it, too, would seem to grow in spite of all odds. Alas, then cats happened, and shamrock met it's match.
I hope you have continued better luck than me!
Some just refuse to be killed :P
Luckily my cat has no interest in succulents. Can't say that about some other plants that she nibbles on thought.