It hasn't stopped entirely but the drop is very steep / drastic. I think that the TFR is down to 1.8 now and the replacement rate needs to be above 1.91 if memory serves so for now it is fine as there is a large(r) number of child bearing aged women to have those 1-2 kids (as opposed to the fewer who needed to have like 5 or 6) but when those numbers drop back down and the population shrinks...then what? It won't be too long before that happens.
One other thing...looking at your sidebar where it says that you are 61...so you would have been born in 1957 or so, correct?
http://www.bbc.co.uk/news/uk-41685693
According to variable and different methodology, people born now, or even when your life is expected to perish will be at least 15 years longer. Sporadically the age of retirement / pension availability has grown but ultimately if people live longer and longer, less and less pay into the system and the tax revenues fall then...
As it is now, there is like a ratio of 1:1 for worker and retiree, right?
Also the bigger question is, who will do the actual work? In healthcare and social care / mobility hospices etc, technology will help a lot, but in time...in the mean time? As Britain ends up with so many seniors who will actually look after them? (If money wasn't even an issue?)