Quibble: surely that should be 'ultimate act'. The meaning of 'penultimate' implies a further ultimate act. Since bonsai are essentially immortal, you would never be able to tell if an act involving one was penultimate?
Essentially immortal? The article seemed to indicate the expected lifespan of this tree was around 200 years, despite it having lived nearly twice that long.
There's no biological limit to their age - only accident/disease statistics.