Trying to copy a struct isn't working

[RamVellanki]

I was trying to use the copier to copy a struct but isn't working for me. Following is the code:

https://goplay.space/#ARoaaKRtM2K

type Cat struct {
    age  int
    name string
}

func main() {
    firstCat := Cat{7, "Wilson"}
    secondCat := Cat{}
    copier.Copy(&secondCat, &firstCat)

    fmt.Println(firstCat)
    fmt.Println(secondCat)
}

I expect the output to print {7, "Wilson"} two times but it prints {7, "Wilson"} {0 }.

[ilius]

Only exported fields are copied. I think because reflect can not set unreported fields.