printf and sacnf on asembly on linux, shared lib, -fPIC

I'm trying to make a task work, but even the example I'm not able to run, the code is as follows:

section .data
SYS_exit    equ 60
EXIT_SUCCESS    equ 0
yourage     db  "How old are you: ",0
willbe      db  "You will be %d years old in ten years.",0xa,0
input       db  "%d", 0
age     dq  0
section .text
extern  printf
extern  scanf

global main
main:
    mov rax, 0
    mov rdi, yourage
    call    printf
    mov rax, 0
    mov rdi, input
    mov rsi, age
    call    scanf
    mov r15, [age]
    add r15, 10
    mov [age],r15
    mov rax, 0
    mov rdi, willbe
    mov rsi, [age]
    call printf
    mov rax, 0
    mov rdi, 0
last:
    mov rax,SYS_exit
    mov rbx,EXIT_SUCCESS
        syscall

To join I'm using the following commands

>yasm -g dwaf2 -f elf64 fonte.asm
>gcc -g -o fonte fonte.o
>.\fonte

But soon after gcc I'm always getting the following error:

/usr/bin/ld: fonte.o: relocation R_X86_64_32 against '.data' can not be used when making a shared object; recompilar com -fPIC
/usr/bin/ld: falha no link final: Seção não representável na saída
collect2: error: ld returned 1 exit status

Does anyone give me a light? I'm really lost in this one but I need to get through this matter!