Your Grandpa is the sweetest person ever, and if it's his birthday, it is necessary to make him feel special on his special day. If you do not know how to make him feel special, we are here to help you out. Here is a list of 100 Birthday wishes for your Grandpa that will make him feel special on his big day. These short messages will make him feel the best and on top of the world. Your sweet gestures will be more valuable than any other gift.