Cal. Rev. & Tax. Code § 20627

A tenant-stockholder claimant (hereinafter referred to as “claimant”) is an individual who, on the last day of the calendar year ending immediately prior to the commencement of the fiscal year for which postponement is claimed is: (a) a tenant-stockholder in a cooperative housing corporation (as defined in Section 216(b) of the Internal Revenue Code) and (b) occupies as a principal place of residence a residential unit in the cooperative housing corporation (notwithstanding Section 216(b) of the Internal Revenue Code). For the purposes of this chapter, a claimant must be 62 years of age or older on or before December 31 of the fiscal year for which postponement is claimed.