With AN's, every path is a gamble (surgery, radiosurgery or observation).
“The best treatment is no treatment, if you can do it”. Dr Michael McKenna (https://www.anausa.org/resources/videos/support-group-video-library
I'm going for a 2 year period of observation, with MRIs every 6 months, before considering the next step. That will give me five MRIs to get a good picture of growth. If there is rapid growth, intervention may be required, otherwise outcomes do not change by observing for 2 years.
With regards to age, a neurosurgical that I spoke to said that age does not matter. It's the general health that matters. Now they are somewhat related, but a healthier lifestyle would keep the fitness levels up which is good if you have to go to surgery and is good generally.
It's also good to read articles on vestibular schwannomas to get a better understanding. Three good ones to get you started are:
* “The Natural History of Vestibular Schwannoma” 2006. http://acusticusneurinom.dk/wp-content/uploads/2015/10/natural-history-of-vs.pdf
* “Active Treatment is Not Indicated in the Majority of Patients Diagnosed with a Vestibular Schwannoma: A review on the Natural History of Hearing and Tumor Growth” 2014 http://www.bhtinformatie.nl/pdf/ingrijpen.pdf
* "Conservative Management of Acoustic Neuroma" 2006 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1502035/