In an area known for palatial abodes, it’s odd to note that several highend condominium developments are cropping up. Keith Green a broker at Halstead Property and head of sales at the new Harbor’s Edge in Sag Harbor, attributes the trend to the fact that “one baby boomer turns 65 every 7.6 seconds.” Having reached that certain age, the postwar generation no longer wants to be strapped to a typical Hamptons’ house where “it takes 11 to 15 people to maintain it.