Stil Learning Signing

I can't believe that my son at 20 months is still learning sign. Even though he is talking so much, he is still interested in new signs. He makes up a sign for new things and then looks at me for clarification, luckily I know a lot of sign, so I am able to give him the right sign and then he copies it. He loves to learn. I hope he never looses that desire. So cool!