Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-vīvo, xi, ctum, 3, v. n., to live on, survive to a certain time (ante-class.): pervixi usque adhuc, Att. ap. Non. 238, 2 (Trag. Rel. v. 417 Rib.): pervivo usque ad summam aetatem, Plaut. Capt. 3, 5, 84.