1867: Born in Warsaw.
1891: Moved to Paris (24 years old)
1898: Discovered radioactivity, polonium and radium (31 years old)
1903: Awarded the Nobel Prize in Physics (36 years old)
1906: Appointed as Professor at the Sorbonne (39 years old)
1911: Awarded the Nobel Prize in Chemistry (44 years old)
1914-1918: Developed mobile radiography units (47-51 years old)
1934: Died of aplastic anemia (67 years old)
Notice how when talking about people, we can not only talk about time in terms of years and dates; we can also talk about it in terms of the individual's lifespan, or age. How does knowing Marie Curie's age at different milestones affect how you think about her life and achievements?