We all change over our lifetime. We are certainly a different person every year. Think back if you are old enough and recall what you were like before. Now you are probably more mature, more poised, smoother, wiser... or perhaps more cynical, more self-centered, more impatient, more worldly.... The point is we are all subject to change, so why not let God change you in the right direction of becoming holier? This would absolutely be the best utilization of the rest of your lifetime. And an exciting adventure will it definitely be too.