As a glorified bump to this thread which appears to be stalled out at the moment I have built this table of Julian Days for the Feb/29 of the years shown, using Julian Date Converter (which has a good description of what that entails), and a resulting span of ages for that particular year’s Leap Day.
4/6/2013 2456388
Year # Julian Ages
2012 - 1 2455986 0-1
2008 - 2 2454525 1-5
2004 - 3 2453064 5-9
2000 - 4 2451603 9-13
1996 - 5 2450142 13-17
1992 - 6 2448681 17-21
1988 - 7 2447220 21-25
1984 - 8 2445759 25-29
1980 - 9 2444298 29-33
1976 - 10 2442837 33-37
1972 - 11 2441376 37-41
1968 - 12 2439915 41-45
1964 - 13 2438454 45-49
1960 - 14 2436993 49-53
1956 - 15 2435532 53-57
1952 - 16 2434071 57-61
1948 - 17 2432610 61-65
1944 - 18 2431149 65-69
1940 - 19 2429688 69-73
1936 - 20 2428227 73-77
1932 - 21 2426766 77-81
1928 - 22 2425305 81-85
1924 - 23 2423844 85-89
1920 - 24 2422383 89-93
1916 - 25 2420922 93-97
1912 - 26 2419461 97-101
The resultant sorted values after 97 voters with those age ranges attached looks like this
View Poll Results: What's your earliest Leap Yeat to be alive?
1976 - 10 12 12.37% 33-37
1984 - 8 11 11.34% 25-29
1960 - 14 11 11.34% 49-53
1980 - 9 10 10.31% 29-33
1964 - 13 10 10.31% 45-49
1968 - 12 9 9.28% 41-45
1972 - 11 7 7.22% 37-41
1988 - 7 6 6.19% 21-25
1956 - 15 6 6.19% 53-57
1948 - 17 6 6.19% 61-65
1952 - 16 3 3.09% 57-61
1996 - 5 2 2.06% 13-17
1992 - 6 1 1.03% 17-21
1944 - 18 1 1.03% 65-69
1940 - 19 1 1.03% 69-73
2000 - 4 0 0% 9-13
Voters: 97