Hi, i love swimming! do you like it?
I do enjoy it!  I am not very good at it though.  At what age did you learn to swim?
I started at ag 9 in school and had a few lessons. Swimming lessons is the process of learning to swim :) 
I feel like I may be too old for swim lessons.  Do they even have lessons for adults?
Yes of course, even from a young age humans can hold their breath underwater, within weeks of birth! 
You are kidding!  A baby can know to hold it's breath underwater!  That is amazing!
I would suggest taking up swimming for sure though, it is consistently among top public recreational activities and in some countries swimming lessons are part of the curriculum