RT

呵呵

elder brother是正确的表示年长的哥哥。

同意二楼！

可有一本练习册上是表示姐姐时用的是old sister

应该是elder brother

我觉得older brother 也可以，至少口语中一直用。elder brother 比较书面气

older和elder不是同一个意思吗

elder: [ 'eldə(r) ]  

a. 年龄较大的,年长的
n. 长者,长辈

例句与用法:
1. He is the elder of the twins.
他是双胞胎中的哥哥。

2. His elder brother got married last month.
他的哥哥上个月结婚了。

3. He is the elder of my two brothers.
他是我两兄弟中年岁较大的.

4. There go my two sons. Can you guess which is the elder?
那是我的两个儿子. 你能猜出哪个大吗?

5. He is her elder by several years.
他比她大几岁.

6. He is the elder statesman par excellence.
他是最优秀的年长的国务活动家.

7. My elder sister had a baby last month, so I am an aunt now.
我姐姐上个月生了孩子，所以我现在是阿姨了。

8. She worked hard in emulation of her elder sister.
她努力赶超姐姐。

older:  

a. 年长的


例句与用法:
1. A male animal that does not mate during the breeding season, especially a young male fur seal kept from the breeding territory by older males.
尚未交配的小雄兽在繁殖季节中未交配的雄性动物，特别指被较年长的雄性拒于交配领地之外的年轻的雄性海豹

2. He has a fixation on older women.
他对于年长的女人有病态的依恋。

3. The babies are left with the older women in the nurseries.
婴儿都交给了托儿所较年长的妇女来照看。

4. Knowledge of self increases as one gets older.
随着年岁的增长，人们的自我认识也不断加深。

5. He was bullied by the older boys at school.
他在学校里受到大孩子的欺负。

6. The older man has gypsy lore.
那个老者有吉卜赛人的学问。

7. Her groom was much older than she was.
她的新郎比她大很多。

8. The manager urged older staff to take up early retirement.
经理敦促年纪较大的职员提前退休。