Lambdas filtro

class User {
    private String name;
    privateCalendar birthDate;
    private String address;
    private String phone;
    private String email;

        // constructores getters y setters
}

Calendar after = Calendar.getInstance();
after.setTime(fmt.parse("01-01-1990"));
Calendar before = Calendar.getInstance();
before.setTime(fmt.parse("31-12-1992"));

List<User> filtered = users.stream().filter(u ->
                    u.birthDate.after(after) && u.birthDate.before(before))
                    .collect(Collectors.toList());