<prompt> unaweza kugeuza matini haya ya swahilikwa kiingereza?lakini, tunapokuwa na umri, tunatumia muda mwingi ndani na pia tunakuwa na ufanisi mdogo katika kufanya vitamini d kutoka jua.  <response>: but, as we age, we tend to spend more time indoors and we also become less efficient at making vitamin d from the sun. 