"Singaporeans are living longer and not having enough babies to replace themselves, meaning the swiftly ageing population has fewer working citizens supporting the growing pool of elderly."Some statistics:
Singapore old age support ratio: 6.4, in 2013. (from singstat.gov.sg) If only citizens are considered, the ratio is 5.5 in 2013.
How good or bad is this ratio? One way to decide is to look at international statistics. OECD has a 2011 report on old age support rates, using 2008 data. Most of the countries have ratios below 5. For OECD, the support ratio is 4.2; Japan, 2.8; Germany, 3.0; Sweden 3.3; Finland, 3.7, Denmark, 3.7.
We do not see these countries falling apart because of their very low support ratios. The huge alarm over Singapore's old age support ratio is an over-reaction.