Slice, link, and append function

What will be the output of the following program?

func main() {
    people := make([]person, 2)

    p1 := &people[1]
    p1.age++

    people = append(people, person{})

    p1.age++

    fmt.Println(people[1].age)
    fmt.Println(p1.age)
}