if me would hazard a guess, the median age of the electorate in the east would be higher than the median age of the voters in the west. Jurong, CCK, Bukit Panjang are considered relatively new towns compared to those like matured estates like Bedok, Telok Kurau, Katong, Kallang, Aljunied. Pasir Ris is considered relatively new in this sense and Punggol & Sengkang are like brand new.
assuming the median age of the electorate of the east to be 50 years old: the older folks thou' had bear witness to the transformation of Singapore, they too have seen the dire straits that the common folks are in. for the males, those folks in their 50s and 40s are the ones feeling the full brunt of the impact caused by the FTs. those in their 30s gets caught in transition stage, some starting a family and finds it tough to get a flat; and 20s just started out in the society not too long ago, 不够熟。
for the female. without their NS obligations, bro JW5 and myself thought that some 7 in 10 females would have been voting for the PAP.
as of the west, assuming the median age to be 40 years old: the number of folks facing the brunt of the FTs would be less noticeable, as more of these folks are grateful that they've got a roof over their heads. so the support for the incumbent would hit higher range of 35%-40%. thus not that difficult to woo another 10% - 20% of the votes coming from the moderate voters.