Yep--anyone registered as being in a domestic partnership, which includes heterosexual seniors (over 62).
http://www.ss.ca.gov/dpregistry/dp_faqs.htm
How do I register a domestic partnership with the State of California?
If you and your partner are of the same sex, or if you and your partner are opposite sexes and one partner is at least 62 years old, then you may be eligible to register a domestic partnership with the Secretary of State. You may register by completing a Declaration of Domestic Partnership, having both partners' signatures notarized, and submitting it with the appropriate fee to the Secretary of State.
(snip)