伯父(伯伯)【bó fù (bó bó)】
1. father's elder brother; uncle 2. polite form of address for a man who is about the age of one's father
[名] 1、父亲的哥哥 2、称呼跟父亲辈分相同而年纪较大的男子

我的伯父(伯伯)比父亲大三岁。
My uncle is three years older than my father.

隔壁的张伯父(伯伯)喜欢下象棋。
Uncle Zhang next door is fond of playing Chinese chess.
伯母【bó mǔ】
1. wife of father's elder brother; aunt 2. polite form of address for a woman who is about the age of one's mother
[名]1、伯父的妻子 2、称呼和母亲同辈而年长的妇女

我的伯母是中学校长。
My aunt is a high school principal.

中国人习惯称呼和母亲同辈、而比母亲年长的妇女为伯母。
In China, an aunt who is elder than one's mother is called "Bo Mu".