Actually, we're starting to get into that situation with demographics right now - it very well might be the time to spend.
I think you might have that backwards.
If we're heading into a demographics crunch NOW, we'd be best to reign in spending as much as possible now, with the expectation that things will get worse in the future. If we spend now, we'll be increasing the debt even more, which will make it harder to deal with the debt in the future.