Designed and printed in the USA. Does wisdom really come with age? This design saying Of course I know everything, I’m 70 is a fun birthday gift for the beloved know-it-all in your life. The design is also available for other ages. Relaxed, tailored and ultra-comfortable short-sleeve t-shirt. You’ll love the way you look in this durable, reliable classic. 100% pre-shrunk, heavyweight cotton (except for heathered colors); Fabric weight 5.0 oz. For best results and to maximize durability machine wash cold, inside out and tumble dry on low heat. Be sure to click on Spreadshirt USA to check out our Amazon Storefront where you will find thousands of amazing designs! We have everyone covered with a design range that includes the weird, the wild and the wonderful.