As your cat gets older it becomes less active and this is especially so in cats over 12 years old the reduced activity can lead to weight loss and a weakening of the muscles there might also be appetite loss because of dental problems and a reduced sense of smell your elderly cat may miss out on the important nutrients and vitamins it needs to grow old gracefully this can cause its fur to become dull and thin and it might suffer from sleeping and behavioural problems a healthy nutrition s