Whether it is convenient for an elderly person in a wheelchair to board a ship depends on the type of ship and its facilities. If the boat is equipped with accessibility features such as ramps, spacious deck areas, and appropriate handrails, it should be easier for a wheelchair user to get on board. However, without these facilities, getting on board can be difficult. It is recommended to consult the shipping company for specific conditions before boarding to ensure the safety and convenience of the elderly.