▁the ▁ 1 9 5 0 s , ▁ 7 0 s ▁and ▁ 8 0 s ; ▁and ▁in ▁all ▁of ▁these ▁different ▁time ▁periods , ▁Richard ▁always ▁appears ▁to ▁be ▁a ▁man ▁in ▁his ▁mid - 3 0 s , ▁not ▁having ▁appeared ▁to ▁have ▁aged ▁at ▁all . ▁The ▁nature ▁of ▁his ▁ag eless ness ▁and ▁his ▁true ▁age ▁is ▁revealed ▁near ▁the ▁end ▁of ▁the ▁series , ▁in ▁the ▁season ▁six ▁episode ▁Ab ▁A et erno ; ▁in ▁the ▁ 1 8 6 0 s , ▁Al pert ▁was ▁str and ed ▁on ▁the ▁island ▁when ▁the ▁Black ▁Rock ▁ran ▁a ground ▁on ▁it , ▁and ▁here , ▁the ▁true ▁leader ▁of ▁the ▁O thers , ▁Jacob , ▁made ▁Richard ▁ag eless ▁in ▁exchange ▁for ▁his ▁loyal ty . ▁At ▁the ▁end ▁of ▁the ▁series , ▁following ▁the ▁death s ▁of ▁Jacob ▁and ▁the ▁Man ▁in ▁Black , ▁Richard ▁becomes ▁mort al . ▁ ▁Origin ally ▁introduced ▁as ▁a ▁guest ▁star ▁in ▁the ▁third - season ▁episode ▁" Not ▁in ▁Port land ", ▁Al pert ▁re app ears ▁throughout ▁the ▁third ▁season , ▁both ▁in ▁flash back s ▁and ▁present - day ▁island ▁events . ▁In ▁the ▁spring ▁of ▁ 2 0 0 7 , ▁shortly ▁before ▁the ▁conclusion ▁of ▁Lost s ▁third ▁season , ▁Car bon ell ▁was ▁contract ed ▁as ▁a ▁regular ▁on ▁the ▁CBS ▁television ▁series ▁C ane , ▁which ▁je op ard ized ▁his ▁future ▁on ▁Lost . ▁ ▁Nevertheless , ▁the ▁ 2 0