Sure, we need a more modern view of productivity over 65, but even if you move productive age average up to 75, and add accommodation for the higher starting age (22-24) for productive (tax paying) contribution, we still have a problem.

Healthcare and social care for humans over 65/70 just is higher. That fact will not change before we have to adjust our social-fiscal systems. The cost of caring must come down or we will go bust trying. The way to bring down labour costs (and the cost of living for all) in the caring sectors is Universal Basic Services.