But a man may not have any of these symptoms and still have prostate cancer, says Gerald Chodak, MD, a Chicago urologist and author of Winning the Battle Against Prostate Cancer: Get the Treatment That is Right for You (Demos Health).
I had no idea there was so much discrepancy in opinion. Newborn is 0-3 months. Infant is 3-24months. Toddler is 2 until 4. 4-5 is preschooler. At 8-12 they become a tween. Teen is 13-18. Young adult is 18-29. 30-65 is middle age. 65+ is a senior.
Key Concepts. 1  1. Infancy: Birth-18 Months Old. 2  2. Toddler / Early Childhood Years: 18 Months to 3 Years. 3  3. Preschooler: 3 to 5 Years. 4  4. School Age Child: 6 to 12 Years. 5  5. Adolescent: 12 to 18 Years. 6  6. Young adult: 18 to 35. 7  7. Middle-aged Adult: 35 to 55 or 65. 8  8. Late Adult: 55 or 65 to Death.