I too have been wondering this . Most headsets explicitly discourage outdoor use and direct sunlight exposure , but Vision Pro is not like most headsets . Following Thread.

1: As of right now the official specifications have not been released. Currently it is reported as being somewhere between 100-120 FOV. I suspect once the Vision OS SDK is released we will have a more concrete answer to this question. 2:Same as previous. 5:For other Near eye display headsets , the common age seems to be 13 . From reading some research papers it seems as the default age of 13 was set to mitigate the risks of early myopia (near sightedness). But many papers also site that there were no short term complications with headset display [technologies.] Google Search for "Ocular effects of virtual reality headset wear in young adults" I suspect that most of your questions will be answered as we get closer to the launch of the product. If fairly certain that there will be some more refinement and minor design changes so until they have a 100% design freeze some of these variables could still be changed