in his mid-20's

in his mid-20's in his mid 30s 这是几岁?how old is mid 30s? She's in her mid He's in his mid-fifties,well,fifty-six,to be后面是to be e_______ be in his mid-thirties其中his有何作用, in one s mid thiries 翻译 in the mid 1810's怎么翻译 in the mid-60s什么意思 in the mid-1990s 和 by the mid-1990s有什么区别? 英语翻译RT还有：popular since the mid 70sintroduces in the mid 80s temperatures in the mid-to high 20's什么意思ornado warnings are in forece with high winds and temperatures in the mid-to high 20's这句话什么意思 mid-1980s是什么意思 mid-1800s Mid$（S,3, her mid-70s his early to mid-30s这句该怎么翻译? in the mid-dell 英语高手请进：In the mid 1970s,那个S的意思?