Question

above与over在形容年龄上的区别，比如children aged twelve and 十二岁和十二

above与over在形容年龄上的区别，比如children aged twelve and 十二岁和十二岁以上的儿童，用above还是over

Answer 1

都可以。children aged （ over ) twelve= children ( above the age of ) twelve
词典解释：

over : 1.(more than)比…多 temperatures of over 40°40度以上的温度well over 500 people远远多于500人
children of/aged over seven7岁以上的儿童
2.(above in power)高于 the officers over him他的上级军官 to rule over a kingdom/the French统治王国/法国人
3.(above in degree)优于 (above in quantity)多于 to have an advantage over one's enemy比敌人更有优势to choose that one over the other选择那个而不是另一个 an increase of 5% over last year's total超过去年总量5％的增长
above : (greater in quantity than)大于 children above the age of 33岁以上的儿童

Answer 2

over 和above
1.都可以表示位置高于···或在···上
eg:They built a new room above/over the garage.他们在汽车房上建
一间新屋.
2.但在表示从某物的一边移至另一边时,只能用over
eg:They jumped over the stream.他们跳过了小溪.
3.而above还与最低限度或某固定点关联（海拔,温度之类的）
eg:2000 feet above sea level 海拔2000英尺
4.over 还可与数目、数量、年龄、金钱和时间连用
eg:It costs over 100.这个值100以上.