Recursive method for calculating the age of a game person

There are n people sitting around asking how old is the nth man, he said he was 2 years older than the n-1, and asked the n-1 individual, who said he was 2 years older than the 3rd, and he said that he was 2 years older than the 2nd, and asked the 2nd man, who was 2 years older than 1th, that he was more than a man in his first year of N-2. The 1th man said he was 10 years old and asked the nth man how old he was.
Tips:

Recursive formula

#include <stdio.h>

int age (int n);

int age (int n)
{
	if (n = 1) return
		;
	else return Age
		(n-1) + 2;
}
int main ()
{
	int n,m;
	scanf ("%d", &n);
	M=age (n);
	printf ("The%dth person's age is%d\n", N, m);
	return 0;
}