Hmmmm..............IMO the term 'antique' is a bit over used for cars that are just 25 years old.
Since I was 16 and already driving when the first 3rd gen was sold. I really feel like an antique.
IMO there will be no change to the value or insurance of your car specifically related to the antique status. It's overall condition, optional equipment and general market forces are much more significant in determining its value.