Preservation Age

gistfile1.php

<?php
/*
Date of Birth - Preservation Age
Before 1 July 1960 - 55
1 July 1960 to 30 June 1961 - 56
1 July 1961 to 30 June 1962 - 57
1 July 1962 to 30 June 1963 - 58
1 July 1963 to 30 June 1964 - 59
After 30 June 1964 - 60
*/

if (($ts = strtotime($dateOfBirth)) !== false)
{
    $age = 55;
    $preservationAge = 60;

    for ($year = 1960; $year < 1965; $year++)
    {
        $min = strtotime('1 July ' . $year);
        $max = strtotime('+1 year', $min);

        ($ts < $min && $year == 1960 || ($ts >= $min && $ts < $max)) ? $preservationAge = $age : $age++;
    }
}