My son had his out @ 14 months. It made a world of difference in him. An ENT inserted tubes when his ears were infected. I questioned the doctor about it and he said it didn't matter. In retrospect, I wish I had listened to my mommy gut on that one.
After continuing with infections, I took him to a pediatric ENT. He tried a couple of different regimens without success and and recommended to take his adenoids and tubes out and see how he did. He said his chances of having tubes reinserted were better than 70% but he wanted the adenoids out ASAP.
The adenoidectomy was very successful. He never required a second set of tubes. I was able to hold him before they took him to surgery. They gave him a syringe of liquid medicine that made him very sleepy. He was somewhat combative in recovery, but they took me right back to him and he immediately calmed down. They cautioned me to keep him resting that day (not an issue with the anesthesia) and by the next day he was back to his normal self.
I know it's rough to prepare for surgery with your kids. This one has a relatively short recovery time and I wish you the success we experienced.