The 1930 census has the family living in Pittsburgh. It shows Charles was first married at age 32 and Rose at 21.
The 1910 census lists a Charles Allen 30, born in VA, living in Pittsburgh as a boarder.
The World War I and II draft cards for Charles Louis Allen, show he was born May 11, 1879 in Clove, Halifax Co., VA, wife Rose Lee Allen, living in Pittsburgh.
I could not find Charles in the 1900 census. I did find a Lewis Chas Allen 1, son of widowed Jno Allen 20 of Halifax Co., VA in the 1880 census (a widower at age 20 with 2 children).
Some of these records you can look at for free at labs.familysearch.org and Ancestry.com. For those you cannot see for free I suggest checking with your local libraries to see if they have Ancestry or Heritage Quest.
There are other avenues of research to try if you are looking for more.