I asked when I was in FL one year and the owner said at least 18 years I'm just shy of that now I've been feeding it a combo of manure and miracid in summer I know the Dominican sisters have cuttings of the orange tree that St Dominic planted in Rome growing and giving oranges in Newark NJ Maybe I'm just rushing it OF no flowers yet like I said maybe I'm rushing it my boy will turn 21 when the tree is 18 he's only 19 now