The chart below shows the EIA (Energy Information Administration) historic and estimated global oil consumption by OECD vs. China+Russia+Brazil vs. India+Africa vs. RoW.
To begin, I'll focus on the present consumers of 70% of the worlds crude, the OECD+China+Russia+Brazil. And if we check the annual change to their combined 0-64yr/old population (blue line in the chart below), 0-64yr/old population growth has decelerated 90% since the '88 peak and cumulatively turns to outright annual declines by 2019. The annual declines accelerate indefinitely from there. I also show total 0-64yr/old annual global growth (black columns) and 0-64 growth among the RoW or Rest of the World (red line).
And if you're curious how this correlates to Federal Funds Rate and global debt accumulation...yup, FFR's peaked in '81 just as the growth rate began decelerating and hit ZIRP just ahead of the demographic waterfall. Obviously, since 1981, the fall in FFR and rise in debt and oil consumption have all been very closely linked.
China, Russia, Brazil
Below, China+Russia+Brazil annual 15-64yr/old population change. Adult population growth has ceased among these nations and will continue falling for decades.
India & Africa
RoW (Rest of World)