I'd rather believe l'm a muggle than that there's no magic in the world.

import java.util.Timer;
import java.util.TimerTask;

import static java.lang.Math.min;

public class Love {
    public static void main(String[] args){
        var i = new Person("I");
        var you = new Person("you");

        Timer timer = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                i.love(you);
            }
        };
        timer.schedule(task, 0, 1000);
    }
}


class Person {
    private final String name;
    private final long begin=System.currentTimeMillis();
    public Person(String name){
        this.name = name;
    }

    public void love(Person p) {
        if (p == null) {
            System.out.println("There will never be someone to love you!");
            return;
        }
        long time = (System.currentTimeMillis() - min(begin,p.begin));
        long centuries = time / (1000L * 60L * 60L * 24L * 36525L);
        time -= centuries * (1000L * 60L * 60L * 24L * 36525L);
        long years = time / (1000L * 60L * 60L * 24L * 365L);
        time -= years * (1000L * 60L * 60L * 24L * 365L);
        long days = time / (1000L * 60L * 60L * 24L);
        time -= days * (1000L * 60L * 60L * 24L);
        long hours = time / (1000L * 60L * 60L);
        time -= hours * (1000L * 60L * 60L);
        long minutes = time / (1000L * 60L);
        time -= minutes * (1000L * 60L);
        long seconds = time / 1000L;

        StringBuilder unit = new StringBuilder();
        if (centuries > 0) unit.append(" ").append(centuries).append(" century").append(centuries > 1 ? "s" : "");
        if (years > 0) unit.append(" ").append(years).append(" year").append(years > 1 ? "s" : "");
        if (days > 0) unit.append(" ").append(days).append(" day").append(days > 1 ? "s" : "");
        if (hours > 0) unit.append(" ").append(hours).append(" hour").append(hours > 1 ? "s" : "");
        if (minutes > 0) unit.append(" ").append(minutes).append(" minute").append(minutes > 1 ? "s" : "");
        if (seconds > 0 || unit.length() == 0) unit.append(" ").append(seconds).append(" second").append(seconds > 1 ? "s" : "");

        String verb = (name.equalsIgnoreCase("they") || name.equalsIgnoreCase("I") || name.equalsIgnoreCase("you")) ? "have loved" : "has loved";
        System.out.printf("%s %s %s for%s.\n", name.toUpperCase(), verb, p.name.toUpperCase(), unit);
    }
}