void age() {
boolean isValid = false;
Calendar user = null;
while (!isValid) {
System.out.print("Enter Date (mm/dd/yyyy): ");
DateFormat df = new SimpleDateFormat("MM/dd/yy");
String s = In.in();
Date date = null;
try {
date = df.parse(s);
} catch (ParseException e) {
System.out.println("Date error");
}
user = Calendar.getInstance();
user.setTime(date);

if (user.getTime().getTime() < calendar.getTime().getTime())
isValid = true;
else
System.out.println("Invalid date. Enter again");
}
int userMonths = user.get(Calendar.MONTH);
int userDays = user.get(Calendar.DATE);

int day = calendar.get(Calendar.DATE);
int month = calendar.get(Calendar.MONTH) + 1;
hours = calendar.get(Calendar.HOUR_OF_DAY);
minutes = calendar.get(Calendar.MINUTE);
seconds = calendar.get(Calendar.SECOND);

Date startDate = calendar.getTime();
Date endDate = user.getTime();
long l1 = startDate.getTime();
long l2 = endDate.getTime();
double d = (l1 - l2) * 0.001;

int[] daysInMonths = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

double yearz = (d / 31536000);
double monthz = ((yearz % 1) * 365) / 30.3167;

int totalMonths = (int) monthz;
int startingMonth = month;
int totalDays = 0;

if (userMonths < startingMonth) {

if (userDays != day) {
for (int i = userMonths + 1; i < startingMonth + 1; i++) {
totalDays += daysInMonths[i - 1];
}
}
} else if (userMonths >= startingMonth) {
for (int i = 0; i <= ((12 - (userMonths + 1)) + month); i++) {
totalDays += daysInMonths[i + userMonths];
}
}
double daysToDivideBy = totalDays / (totalMonths + 1);
double dayz = ((monthz % 1) * daysToDivideBy);

System.out.println("You are: \nYears: " + (int) yearz + "\nMonths: "
+ totalMonths + "\nDays: " + (int) dayz + "\nHours: " + hours
+ "\nMinutes: " + minutes + "\nSeconds: " + seconds + " old");
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis((long) d);
DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.SSS");
System.out.println(formatter.format(calendar.getTime()));
}

This is what i have so far. It calculates the year and month correctly but it has a little trouble with the day
Ex.
if the user enters Dec. 1, 1990 for their birth date the output should be
You are 19 years, 4 months, 12 days, 8 hours, 44 minutes, and 39 seconds old.

Thanks in advance