What’s going on here? I think variable problems.

[Ctylersills]

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <math.h>

int main()
{
	int age;
	
	puts("How old was Methusalah?");
	scanf(&age);
	printf("Okay, so...Methusalah was %d years old.", age);
	
	
	return 0;

Just 2 days ago I was writing MUCH more complex programs. Now I can’t get a basic int variable to store input from the user. Wtf have I done wrong? It keeps saying Methuselah was 0 years old, no matter the input value.