Like other succulents, Aloe Vera Plants tend to grow slowly, as a way to reserve water and nutrients. It usually takes a few years for an indoor Aloe Vera Plant to reach its full size, which is about 18 inches. With proper care, an Aloe Vera Plant can live up to 12 years. However, by pruning and repotting offsets, you can ensure that you will always have an Aloe Vera Plant thriving in your home.