function userAgeCheck(username) {
  return new Promise((resolve, reject) => {
    pool.getConnection((err, connection) => {
	  var query = 'SELECT username, age, orientation FROM usersinfo WHERE username != ?';
      connection.query(query, [ username ], (err, rows, fields) => {
		connection.release()
		return err ? reject(err) : resolve(rows);
       });
     });
  });
}

userAgeCheck('username')
  .then((rows) => {
    // do stuff
  }).catch((err) => {
	throw err;
  });