The lifespan of an emergency training manikin depends on several factors:

• Frequency of use: Manikins used intensively may require more frequent replacement.
• Maintenance: Regular cleaning and disinfection can extend the manikin's life.  
• Material quality:High-quality manikins tend to last longer.
• Signs of wear and tear: Look for damage to the skin, joints, or internal components.

Generally, it's recommended to inspect manikins regularly for signs of deterioration. If you notice significant wear and tear, or if the manikin no longer effectively simulates real-life conditions, it's time for replacement. Additionally, consider replacing manikins that are outdated in terms of medical practices and procedures.

By carefully evaluating these factors, you can select and maintain emergency training manikins that effectively support your training goals.