Harriet, this BB is probably not the best place to get legal residency info. <g> I don''t think you''ll have a problem, even without a shoreside residence or vehicle, but I''d suggest you call the voter''s registrar and tax collector in your county, write down the names of the folks with whom you talk, and describe to them what you have in mind. Be sure to ask confirm how you retain currency of those things that, for you, will maintain Florida residency - e.g. keeping a FL driver''s license current. In both cases, mention that your son will be handling your mail from VA and ask if they see a problem with that re: FL residency.
Often the problem isn''t continuing residency where you have been residing; it''s finding that another state is claiming you (and your net worth) as a resident because they have ID some basis for doing so.