UDT inheritance ,objects . Oracle

query.sql

create or replace Type Personobj as object(
fisrt_name varchar(20),
last_name varchar(20),
date_of_birth Date,
member function getAge return number
);

create or replace type body Personobj as 
member function getAge return number is 
begin
    return trunc(Months_between(sysdate,date_of_birth)/12);
  end getAge;
  end;
  
create table people(
id number(5) not null,
person Personobj
);

desc Personobj;

insert into people
values(1,Personobj('Ram','Singh',to_date('01-09-1982','DD-MM-YYYY')));

commit;

select * from people;

-- Accessing the object
select p.id,p.Person.fisrt_name as name,
p.Person.last_name as last_name ,p.Person.date_of_birth as dob,
p.Person.getAge() age
from people p;