Context: Just reached 40 + a few months I don't know how to become smarter, but I definitely know how to become dumber: - Sleep less - Joints problems coming

Context: Just reached 40 + a few months I don't know how to become smarter, but I definitely know how to become dumber: - Sleep less - Joints problems coming from few physical activity due to COVID WFH + I hate exercises - Suddenly had hay fever after so many years - Pressure from work + kid - Financial pressure from owning some property (essentially, when you have a 30-yr debt, saving for a few years of spending does not feel safe at all) I figure you can at least avoid some of these by making the right decisions.