Used shortboard

Hey, im 14, i live on long island, im 5'8'', i weigh about 117 and i have been surfing for about 1 summer. i have a 5'10" waterlogged 26 year old surfboard. i recently found a used surboard and i was wondering if the demensions were good for me. The board is 6'4"x 21 1/2 x 2 5/8. what do you think of this board