Happy Birthday Wishes for 20 Year Old Grandson: Looking for some birthday wishes for your grandson who will be turning 20? After reading this post, I hope you have discovered some of the greatest happy birthday quotes for a 20 year old grandchild that you can give to him on his special day. You may send them to him if you want to make his day more memorable. The Happiest Birthday Wishes Ever for Those Turning 20 Years Old: Are you ready to turn 20 and you have no idea what people should wish ...