You're Only Old Once! by Dr. Seuss
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Like all Seuss books, this one kids and adults love instantly. However, this book is aimed less at kids and more at adults. In fact, on the back of the book, it reads "Is this a children's book? Well...not immediately. You buy a copy now and give it to your child on his 70th birthday." A book that should be read, because, after all, you're only old once.

