Sorry, to answer your question, YES your corn will continue to grow throughout it's entire life.
At 1.5 years I doubt it is full grown right now. If you are feeding it appropriately-sized food, you should see a steady increase in growth for awhile yet. As it gets years older the growing will slow down considerably, and may seem to stop - but it won't stop. A shed means the snake has grown. For example, instead of seeing a shed every 4-8 weeks as you would around your snake's age, at 5 years old the snake may only shed every couple of months or so.
What size of enclosure is your snake in now?