elder /ˈeldə/ I.adj. (old的比较级年长:My elder brother is three years older than I/me.我哥哥比我大三岁。 ‖II. n.c 长者;(pl.)前辈,父老:Shouldn’t we respect our elders? 我们不应该尊敬老人吗

[辨析]old 

elderly /ˈeldəli/ I. adj. 1.较老的,年长的:My father is getting elderly and can’t walk very fast. 我父亲上了年纪,走路走不快。 2.老式的,过时的:pieces of elderly furniture 几件老式家具 ‖II. n. (the elderly) 上了年纪的人:The elderly are inclined to cold. 上年纪的人容易得感冒。