在英语中，一位老人可以用“an elderly person”来表示。来源是因为这个词组表示一个年龄较大的人，其中“elderly”一词源于古英语“eldra”，意为“年长的”。例句可以是：

The elderly person was walking slowly with the help of a cane.

The nursing home is a great place for elderly people to live in.

I always make sure to be kind and respectful to elderly people.