Peter -

If you go to www.findagrave.com and enter memorial #93622160, I have added Julia's obit which has the information you are looking for except for parents. However, it says she came to the U.S. with her parents and there is a John Corlett born in 1803 who is also buried at the Galva Cemetery #122275610. I found an obit for this John so I'm 99% sure this is him. Here is the obit:

Died. Wednesday Jan. 9th 1892, at the home of his daughter three miles southeast of Galva - John Corlett in the 92ns year of his age. Mr. Corlett was a native of the Isle of Man and came to this country early in the "fifties," and has resided in Peoria and Knox counties continually since then. He had scarcely known a day of sickness, until his extreme age began to bear on him about a year ago. A daughter, (Mrs. James Kermeen) and two sons residing in Nebraska, beside nearly a scor of grand children and great grand children survive him.

The Galva Weekly News - Galva, IL, Thu., Jan. 10, 1895

Hope this helps! Michael