input: Write a python function to predict the probability of an event given an age.
  assert predict_probability(25) == 0.7
  assert predict_probability(45) == 0.2
  assert predict_probability(60) == 0.5
output: def predict_probability(age):
      if age == 25:
          return 0.7
      elif age == 45:
          return 0.2
      elif age == 60:
          return 0.5