2/24/2008: If anyone has any information regarding experiencing chickenpox after 18 years old, please contact me. I am particularly interested in whether persons that have experienced this rare occurence has also commonalities in other areas as well. If you respond, please give a history of what illnesses or exposures or anything environmental you think might have contributed to your immune system allowing you to encounter chickenpox later in life. I have communicated with doctors who haven't given much information at all-just that it is rare. Thanks!