My grandfather is a 89-year-old lawyer and you can find him every morning on his office, including weekends. He uses a typewriter and is actually very fast on t

My grandfather is a 89-year-old lawyer and you can find him every morning on his office, including weekends. He uses a typewriter and is actually very fast on those. He is incredibly lucid and and claims it's because of his work, which I agree. Always working - or, in other words, exercising your brain - is a must to keep your memories and sanity.