Calling a Postgres db function in Node API

I am trying to call this Postgres function core.get_age(bigint) in my queries.js

function getAge(req, res, next){
  var customer_id= parseInt(req.params.customer_id);
  db.one('SELECT * FROM core.get_age($1)', customer_id)
    .then(function(data){
      res.status(200)
        .json({
          status: 'success',
          data : data,
          message: "Retrieved Age"
        });
    })
}

Any my routes in index.js

router.get('/api/age/:customer_id', db.getAge);

When i call http://localhost:8080/api/age/10 in POSTMAN i get 404 error.

What is wrong? This is the first instance i am trying to call a Postgres function(). Just trying to retrieve Postgres table with select * from this.this table works but with function I am getting this 404.

via OLDMONK