Need Advice from Seasoned Parents

Is there a second round of "I'm not telling you what I'm doing in my life" that happens in their 20s/college years?  I've survived the teenage years but recently I feel like I'm going through a second round if it where I only get fragments of information.  I don't need to know his whole life - he's an adult, but when he comes home for the holidays and he's headed out and I say "where are you headed?" and I get vague "out all day with friends" sentences....  it's just a little irritating and I'm trying to navigate my own feelings about it because I know it's none of my business.  I'm just looking for general data, and I feel like he thinks I'm inquiring into his every move.