Search engine yielded both the rest of the poem and the identity of the author.
少小離家老大回，鄉音無改鬢毛衰。
兒童相見不相識，笑問客從何處來。
(as above)
離別家鄉歲月多，近來人事半消磨。
惟有門前鏡湖水，春風不改舊時波。
I have left home for so long, society has lost its meaning.
There are only the waters of Mirror Lake before the door, and the spring winds cannot change the ripples of the past. [my translation]
The author is Hè Zhīzhāng (賀知章), a Tang Dynasty poet. The poem comes from the second part of his book Images of Homecoming (回鄉偶書). He is one of the Eight Immortals of the Wine Cup (ie. alcohol-loving Tang poets): http://en.wikipedia.org/wiki/Eight_Immortals_of_the_Wine_Cup
少小離家老大回，鄉音無改鬢毛衰。 兒童相見不相識，笑問客從何處來。
(as above)
離別家鄉歲月多，近來人事半消磨。 惟有門前鏡湖水，春風不改舊時波。
I have left home for so long, society has lost its meaning. There are only the waters of Mirror Lake before the door, and the spring winds cannot change the ripples of the past. [my translation]
The author is Hè Zhīzhāng (賀知章), a Tang Dynasty poet. The poem comes from the second part of his book Images of Homecoming (回鄉偶書). He is one of the Eight Immortals of the Wine Cup (ie. alcohol-loving Tang poets): http://en.wikipedia.org/wiki/Eight_Immortals_of_the_Wine_Cup
Coming from Japanese or modern Chinese you can use http://www.mdbg.net/chindict/chindict.php to understand the relationships between words. Also try http://chinesenotes.com/classical_chinese.php for grammatical background. More Tang poems @ http://chinesenotes.com/classics.php