How is my score so high?

My credit score is now 781 and I am 20 years old. My oldest credit account is exactly 2 years as of today. I have 12 revolving accounts (10 cards, 2 credit lines) and 0% utilization. I use 2 credit cards for everything and pay it off immediately. My lines of credits are student lines that I haven't used.

Why is my score so high. It had been 742 for a year now which I already thought was high.

Im not complaining obviously. Just curious why so high?

This is from TransUnion (my banks partner)