Slime and Magma Cube Aging

I think it would be really cool if the Slime and Magma Cubes gain the aging feature that the Sulfur Cubes do, split them up and over time they grow up. Maybe the slimes even grow to their max giant size if given enough time. I think this would give the older mobs a bit more functionality and be really cool for farms and builds. Please Mojang, let me farm slimes.