Cactus

I am not sure how long I have had this cactus plant - maybe 10 plus years.  I do remember purchasing it at the Denver Botanic Gardens Cactus and Succulent sale, but I couldn't tell you when.  It spends the winter in the kitchen in front of the north facing window and then it spends the summer outside on the front porch.  I actually just noticed the other day that it has grown quite a bit over the last couple of  years and it has started to outgrow the pot.  I probably should re-pot it this summer.