Complex sentence: The mean age of presentation is just older than 2 years, but this entity has been reported in infants younger than 6 months (60) (61) and in older children up to the preteen years.
Split into simpler sentences: The mean age of presentation is just older than 2 years. This entity has been reported too in infants younger than 6 months (60) (61) and in older children up to the preteen years.