Horatio Lovell is listed in the 1910 Census of Sacramento (Ward 6), Sacramento, California:
Horatio Lovell - age 79 (b. 1831) - born in England - living in 919 Main Ave St. (rear) - white - male - immigrated in 1847 - widowed - father and mother born in England - naturalized.
Malcom MacKenzie - age 17 (b. 1893) - born in California - grandson - father born in Scotland and mother born in California
1910 U.S. Census, Sacramento, Sacramento, California (E.D. 0118), pop. sch. 7A (handwritten), dwell. 81, fam. 139.
https://www.ancestry.com/imageviewer/collections/7884/images/31111_4327296-00078?usePUB=true&usePUBJs=true&pId=1450421
https://www.familysearch.org/ark:/61903/1:1:MVLP-9FV
Here he is in the 1860 U.S. Census of Sacramento:
https://www.familysearch.org/ark:/61903/1:1:MDKN-FMQ
Here he is in the 1850 U.S. Census of Sacramento:
https://www.familysearch.org/ark:/61903/1:1:M4SM-X2B
There is a Horatio Lovell listed in the 1870 U.S Census of Colusa, Colusa County, California:
Horatio Lovell - age 40 (b.ca. 1830) - born in England - white - mail laborer - parents of foreign birth.
1870 Census, Colusa, Colusa County, California, pop. sch. 290 A, dwell. 43, fam. 43 (household of David Bird).
https://www.ancestry.com/imageviewer/collections/7163/images/4259309_00054?usePUB=true&_phsrc=qcN41438&_phstart=successSource&usePUBJs=true&pId=622676
I suspect that these may be records of his death in 1911:
https://www.familysearch.org/ark:/61903/1:1:QK91-13HM
https://www.familysearch.org/ark:/61903/1:1:8CL1-L5N2