Write a method that calculates the age in years given a birth date. The method should return the number of complete years between the birth date and today.

For someone born on February 29th (leap year), treat their birthday as February 28th in non-leap years when determining if they have reached their birthday this year.

Examples:

Date birthDate = Date.newInstance(1990, 5, 15);
Integer age = calculateAgeInYears(birthDate);
// Result depends on current date, but should be accurate age in years

Date recentBirth = Date.newInstance(2023, 12, 25);  
Integer youngAge = calculateAgeInYears(recentBirth);
// Should return 1 if current date is after 2024-12-25, 0 if before

Date futureBirth = Date.today().addDays(30);
Integer futureAge = calculateAgeInYears(futureBirth);  
// Should return -1 for future birth dates
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