code: def from_age_range(start_age, end_age):
          
          if start_age < 0 or end_age < 0:
              raise ValueError('start_age and end_age can\'t be negative')
          
          if start_age > end_age:
              start_age, end_age = end_age, start_age
              
          today = datetime.date.today()
          
          try:
              start_date = today.replace(year=today.year - end_age - 1)
          except ValueError:  # February 29
              start_date = today.replace(year=today.year - end_age - 1, day=28)
          start_date += datetime.timedelta(days=1)
          
          try:
              end_date = today.replace(year=today.year - start_age)
          except ValueError:  # February 29
              end_date = today.replace(year=today.year - start_age, day=28)
          
          date_range = DateRange(start_date, end_date)
          return DOB(date_range=date_range)
docs: Take a person's minimal and maximal age and return a new DOB object 
          suitable for him.