On the stock side my old targets were 60 domestic / 40 international, per Vanguard's recommendation.
To correct a previous post, Vanguard's 60/40 recommendation isn't based on the global breakdown, that would be more 50/50. Vanguard's 60/40 is based on diversification and volatility. International is historically more volatile than domestic, but combining them together results in lower volatility thanks to the extra diversification. Based on Vanguard's research, you get the best diversification benefits in terms of decreased volatility by being slightly heavier on domestic, hence the 60/40.
About a year ago I changed my international sub allocation to 50/50, to match the global breakdown.
Most of the international funds are heavily weighted in the countries who’s population is stagnant or shrinking. Not a good growth opportunity if you ask me.
The US is still growing because of immigration. Without immigration we’d be the same as them.
If you invest in an international index, like VXUS, most of your money is going to multi-national corporations like Shell, Toyota, Samsung, Nestle, etc. Population growth within their home country isn't a primary driver for such a company. Example: Nestle does significantly more business in the US than in Switzerland.