Calculate Age

I am trying to write a function that calculates the age of an individual exactly...not worried about month or days just years...every php function I have tried to use only calculates back to 1970...therefore anyone born before 1970 would show an age of 32. I need this function to be able to calculate the age of someone born back in the early 1880's and later...I have thought of just a basic calculation like this:

PHP Code:

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function calculate_age($year)
{
    $today  = getdate();
    $tyear  = $today['year'];
    
    $age = $tyear - $year;

    return $age; 
} 


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but it will still be inaccuarate....any ideas???

I figured it out....here is the function if anyone is interested.
It will calculate the age for someone born in the year 1 A.D. to now.

PHP Code:

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function calculate_age($m, $d, $y)
{ 
    $now = getdate();
    $nmonth = $now['month'];
    $nday   = $now['mday'];
    $nyear  = $now['year'];
    
    if ($nmonth < $m OR $nmonth = $m AND $nday < $d) {
        $age = $nyear - $y - 1;
    } else {
        $age = $nyear - $y;
    }
    
    return $age; 
} 


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