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import pandas as pd
data = {
  "age": [50, 40, 30, 40, 20, 10, 30],
  "qualified": [True, False, False, False, False, True, True]
}
df = pd.DataFrame(data)
newdf = df.sort_values(by='age')
print(newdf)
     age  qualified
  5   10       True
  4   20      False
  2   30      False
  6   30       True
  1   40      False
  3   40      False
  0   50       True