массив структур в Golang

package main

import (
"fmt"
"sort"
)

type Person struct {
Name string
Age  int
}

func (p Person) String() string {
return fmt.Sprintf("%s: %d", p.Name, p.Age)
}

// ByAge implements sort.Interface for []Person based on
// the Age field.
type ByAge []Person

func (a ByAge) Len() int           { return len(a) }
func (a ByAge) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a ByAge) Less(i, j int) bool { return a[i].Age < a[j].Age }

func main() {
people := []Person{
{"Bob", 31},
{"John", 42},
{"Michael", 17},
{"Jenny", 26},
}

fmt.Println(people)
sort.Sort(ByAge(people))
fmt.Println(people)

}