Anecdata: I am 22 and I have a bunch of cousins but they are all from generations older than me, so while my half-siblings had a bunch of cousins to hang out with - I don't really have any. The closest I have that are my age are 3 2nd cousins (cousin's children), and we see each other once every 2-3 years. Every time we see each other we end up complaining about how few people are in our family in our generation.

On the other hand, all of my actual cousins are now having children, so it seems the next generation won't be having this problem (in my family).