I know many things can effect our sense of taste, whether it is caused by cancer treatments, zinc deficiency, certain drugs, smoking, and so on. As for our sense of taste evolving as we get older, I don't see much of a correlation.
Of course, taste and smell along with your other senses will slowly decline with really old age.
Anyway, to be more germane, I just read on a .gov website: "The number of taste buds decreases beginning at about age 40 to 50 in women and at 50 to 60 in men. Each remaining taste bud also begins to atrophy (lose mass). The sensitivity to the four taste sensations does not seem to decrease until after age 60, if at all. If taste sensation is lost, usually salty and sweet tastes are lost first, with bitter and sour tastes lasting slightly longer."