Final answer:
Osteomyelitis can occur at any age, affecting newborns through hematogenous spread, children and adults usually via hematogenous spread or trauma, and the elderly, though they also face age-related bone conditions.
Step-by-step explanation:
Osteomyelitis is an infection of bone tissues that can occur at any age. In newborns up to 4 months, osteomyelitis often manifests from S. agalactiae transmitted during childbirth, leading to early onset disease in the first week and late-onset up until 3 months. Children between the ages of 4 months and adulthood mainly experience infection in long bones due to extensive vascularization making it easier for bacteria to spread, while adults often acquire the infection through trauma or surgical procedures. Elderly individuals can also be affected by osteomyelitis, but it's distinct from age-related bone conditions like Paget's disease or osteoarthritis, which are more prevalent in this age group.