Solution 1: Reflection and Interfaces

package main
import (
	"fmt"
	"sort"
)
// Define a struct type
type Person struct {
	Name string
	Age int
}
type persons []Person
// Implementing sort.Interface - START
func (p persons) Len() int {
	return len(p)
}
func (p persons) Less(i, j int) bool {
	return p[i].Age < p[j].Age
}
func (p persons) Swap(i, j int) {
	p[i], p[j] = p[j], p[i]
}
// Implementing sort.Interface - END
func main() {
	// Create a slice of Person structs
	people := []Person{
		{"Alice", 25},
		{"Bob", 30},
		{"Charlie", 20},
		{"Dave", 35},
	}
	// Sort the slice using the sorting criteria defined for "persons"
	sort.Sort(persons(people))
	// Print the sorted slice
	fmt.Println(people)
}