It seems like she is either growing a beard for Christmas of perhaps letting loose and going the hippie route. Two seasons of excellent anti-fouling paint have long since worn off. The boats attractive bare underside has now become a high scale crustacean community complete with a great ocean view. Eventually, what happens is the crustaceans begin to pile up on one another causing drag andslowing a vessel down when underway. Barnacles can also reduce the barrier paint which protects raw metal from the corrosive surrounding salt water.
Wooden boats are particularly susceptible to toledo worms and other borers.
In the old days when all ships were made of wood and men made of steel, lead and copper sheathing was used to prevent fouling. The sheathing was effective for only so long and sailors would still have to dive below and scrape the hull. A horrible punishment banned in the late 1800s. Cuprous oxide is the traditional ingredient in most of these paints. At one time lead and mercury was the main additive but have since been banned due to the very high toxicity levels they were releasing into the sea.