What is Dr. Kureha's secret? In the Drum Island arc, Dr. Kureha always asks this:



So, what is the secret of her youthfulness? Is it because of her medicine? Her lifestyle? Maybe she found a fountain of youth?
She being a doctor, must have found some medicine which she drinks from her beer bottle.
Also she was the first one to mention the will of D and she knows the actual name of Gol D Roger, shows that she actually must be around 140 years of age.