if else not working with this code in c program [closed]

i am beginner so i do not understand what is the error here, when i enter age it only print the else statement and when i copy the same type of the program then it works fine

#include <stdio.h>
int main()
{
    int age;
    printf("enter the age\n");
    scanf("%d", age);

    if (age >= 90)
    {
        printf("yes you are old man\n");
    }
    else
    {
        printf("not the old man\n");
    }
    return 0;
}

OUTPUT:

enter the age

88

not the old man

enter the age

99

not the old man