I've heard a lot of people saying that! I wonder why not so many guys want to date anymore?!
Because people are getting sense.
The world is currently (metaphorically) smaller than ever, and people are realising that possibilities to explore and travel are endless compared to times gone by. Traditionally, people found someone and settled down at a young age, because international travel and exploration wasn't as accessible as it is now.
In my own opinion, there a million and one things more important than dating or relationships. And when you think about it, why would anybody truly want to date in their 20s? The only purpose it serves in your 20s is to learn what kind of person you do and don't want to end up settling down with. Other than that, it's just neediness or subconscious peer pressure.