octogenarius

Three _vitae_ (i. _a_, _b_, iii. _c_) state that he was at that time _octogenarius_.

The Student's Companion to Latin Authors Thomas Ross Mills

At his death, an old friend and very learned man, _Andreas Rawinæus octogenarius_, composed some Latin verses, as an affectionate tribute to his memory.

The Works of the Rev. Hugh Binning Hugh Binning 1640