GDP - projections up to 2060 (Status: 2016)
The period from 2008 up to 2015 were turbulent times for the global economy. This can also clearly be seen in the Run-Up of the Chinese economy (in Gross-Domestic-Product terms) versus the so called industrialised countries:
In the long run, Gross-Domestic-Product Growth can be achieved via technology-advances, population growth, "intelligent" consumption of households and the Government, through (Infrastructure-)Investments by the Government and private companies. etc.
link (OECD-forecasts): https://data.oecd.org/gdp/gdp-long-term-forecast