We had one join the Army, the next one joined the AF, the next one went off to UCSB, the next one we took up to UC Berkeley and my youngest one got married without telling us then when he finally told us it was just the night before he left to go to San Diego to be with his wife who was in the Coast Guard. Heart ache's by the half dozen, so I know how your feeling. It's difficult to let go but they need their trials and error in order to continue growing. Just be there for him when he needs you.