There are currently a couple of popular centenarians on the famousbirthdays site, names I'd also recommend for your pools:
Kane Tanaka, #1 in 1903 births
Fauja Singh, #5 in 1911 births. Even though Singh's age isn't probably that much.
Boris Pahor, #18 in 1913 births
Norman Lloyd, #5 in 1914 births
Ida Keeling, #22 in 1915 births
Marsha Hunt, #26 in 1917 births
Anne Buydens, #21 in 1919 births
Charles MgGee, #33 in 1919 births
Arlene Cody Bashnett, #42 in 1919 births
Tom Moore, #3 in 1920 births
and I'd list the possible soon-to-be centenarians here too:
Prince Philip, #1 in 1921 births
Iris Apfel, #22 in 1921 births
and Hazel McCallion, #26 in 1921 births.