Dear Thomas Maher,
Thank you for posting your question to history hub.
The Federal Government does not ordinarily create or maintain birth, adoption, death, marriage or divorce records. Such records are made and kept by State and local governments rather than the National Archives. We suggest searching substitute record sources such as probate records, church records, and newspaper records that may uncover more information about your grandfather.
The vast majority of records in our collection are not name-searchable. For more information on conducting genealogical research within our records, please visit our webpage: https://www.archives.gov/research/genealogy.
The Census is a great resource for verifying age as well. *Learn more about census records and how to access them here: https://www.archives.gov/research/genealogy/census/about
We suggest that you review the FamilySearch Research wiki page for the state in which your grandfather was born and/or lived/died. https://www.familysearch.org/wiki/en/Main_Page.
We hope this information is helpful in your research!