I totally feel you, it gets harder to find friends who don't have kids and who talk about anything else except their children. You can't relate so instead just sit there and wait patiently until they're done before you're like: "So i went on a hike the other day...the mountains were so beautiful!"...then you just sit there in awkward silence
I love my nieces and nephews to bits, i spoil them like crazy when they come to my house...but i am always glad when they leave and become their parent's problems <3