At what age are nearly all bones completely ossified?Multiple ChoiceBirth5 years15 years25 years

To determine the age at which nearly all bones are completely ossified, we can analyze the developmental milestones in human skeletal development.

1. Bone Development Overview: Ossification is the process through which bone tissue is formed. It begins in the fetal stage and continues into childhood and adolescence as the skeleton matures.

2. Timeline of Ossification:

   • Birth to Infancy: At birth, some bones are still cartilaginous. For example, the fontanelles in the skull remain soft to facilitate passage during childbirth.
   • Infancy to Early Childhood: Rapid ossification occurs during the first few years. By around 5 years, many of the long bones are mostly ossified.
   • Late Childhood to Adolescence: Ossification continues as children grow. By around 15 years, most of the bones are adequately ossified, but some bones, particularly the long bones, may not be fully matured.
   • Adulthood: Almost all bones become fully ossified by the age of 25.

3. Conclusion: Considering the options provided:

   • Birth: Bones are not ossified.
   • 5 Years: Most bones are nearly ossified, but not all.
   • 15 Years: Many bones are ossified, but some growth plates remain open.
   • 25 Years: Nearly all bones are completely ossified.

Final Answer

25 years is the correct answer, as nearly all bones are completely ossified by this age.