Relationship between median age and number of countries

number of countries (Already selected) number of regions agricultural land forest area land area rural land area urban land area central government debt expense GDP self-employed workers tax revenue unemployment vulnerable employment access to electricity alternative and nuclear energy electricity production from coal sources electricity production from hydroelectric sources electricity production from natural gas sources electricity production from nuclear sources electricity production from oil sources electricity production from renewable sources, excluding hydroelectric net energy imports fossil fuel energy consumption renewable energy consumption carbon dioxide emissions (CO2) methane emissions nitrous oxide emissions greenhouse gas emissions (CO2, CH4, N2O, HFCs, PFCs, SF6) urban population living in areas where elevation is below 5 meters health expenditure health expenditure per capita hospital beds incidence of HIV suicide mortality rate armed forces personnel internally displaced persons, by conflict and violence military expenditure birth rate death rate fertility rate individuals using the Internet life expectancy at birth net migration female population male population population proportion of seats held by women in national parliaments rural population urban population press freedom democracy score median age

number of countries number of regions agricultural land forest area land area rural land area urban land area central government debt expense GDP self-employed workers tax revenue unemployment vulnerable employment access to electricity alternative and nuclear energy electricity production from coal sources electricity production from hydroelectric sources electricity production from natural gas sources electricity production from nuclear sources electricity production from oil sources electricity production from renewable sources, excluding hydroelectric net energy imports fossil fuel energy consumption renewable energy consumption carbon dioxide emissions (CO2) methane emissions nitrous oxide emissions greenhouse gas emissions (CO2, CH4, N2O, HFCs, PFCs, SF6) urban population living in areas where elevation is below 5 meters health expenditure health expenditure per capita hospital beds incidence of HIV suicide mortality rate armed forces personnel internally displaced persons, by conflict and violence military expenditure birth rate death rate fertility rate individuals using the Internet life expectancy at birth net migration female population male population population proportion of seats held by women in national parliaments rural population urban population press freedom democracy score median age (Already selected)