In general, it has increased, especially in the developing and
developed countries.
However, an increase in lifespan is nothing if there's a
corresponding decrease in the quality of life. What's the
point of living up to 100 if one ends up being unable to feed
oneself, unable to do anything for oneself except lie in bed,
staring at the ceiling, waiting for the carers to clean one
up.
All said, working here in Melbourne, I come across more elderly
folks who are in their 90's and there are more folks who hit 100
and beyond, whereby they get a letter from the Queen congratulating
them on the milestone. 
Back in Singapore, I think I've only seen
octogenarians.
