In general, Dominic Greenyer, a private GP at The Health Suite, told HuffPost UK: “Ageing naturally brings some change. People may notice a modest reduction in muscle mass, bone density, cardiovascular fitness, hearing, vision or the speed at which they process information.
Article source: https://www.huffingtonpost.co.uk/entry/healthy-vs-pathological-ageing_uk_6a7c70b5e4b0ecad6d3d91c5