Never. It's ironic (and sad) how life changes the older we get, but I have cousins younger than me whom I babysat when they were babies, and I haven't seen them in years... decades in fact, and as for the older cousins I have that were the same age as myself... the cousins I remember spending so much time with as kids, they, too, have quietly faded from the picture.
I've come to the realisation that the cousins I was close to growing up, was the result of my parents being close with those cousins parents, and once those longstanding relationships started dissolving through age, sickness, death, and everyone leading busy lives, there was nothing left to retain the closeness among us cousins, and as silly as that may sound, when distance applies and there's no one left to bring the parties together, it's surprising how fast people move on with other interests in their lives, and that's what essentially happened in my case.
Fast-forward to the years following school, when so many of us move on to build lives for ourselves, outside of the scope of our parents, then childhood bonds are pulled apart at an even greater rate, but I found when we all reached the point and stage when we were all raising families, that's when I truly recognized the end of what I knew growing up. Daily life made it all too easy to forget, and before long, a new generation is born that you have never met, and as age sets in more and more, you get to the point where you care less and less. That's the point I reached.
And of course in covering a topic such as this, the overall nature of people and how they change with age cannot be overlooked, and while many of my cousins are grounded and well-adjusted people to this day, there's a good number who aren't, making it (once again) that much easier to have nothing to do with them.