4 Time... 3 4 5 6 7 8 9 10 12 15 16 years. years. years. years. years. years. years. years. years. years. years 30 Time.. 20 21 24 25 31 35 40 45 50 53 years. years. years. years. years. years. years. years. years. years. years Time.. 55 60 2-103-13 3-4 2-403-20 7-8 3-45 8-15 | 10-12 years. years. years. years. years. years. years. years. years. years. years Michigan. Dept. of Health, Michigan. State Board of Health |