something about my mood

I always have the query that what i can do when i am in forties. This puzzled me for several years. And i think now the most important thing is to keep the good mood, improve my special ability and language lever. for example: control myself at anytime(however happy or angry), study more on quality related, constantly strengthen my english lever(although it's not very obvious all along after i put my enormous efforts on this).
i feel my physical and mental status are not as good as the previous, for they gradually diminished. i am not young and little by little grow older. it's a horrify thing and i am really reluctant to face this. It's extremely doubtful whether i would get some accomplishments later in my career.
Whatever the status change, one thing is certain, i cann't give up doing some thing and keep me spiritful. i will manage to make me perfect until become a graceful old woman.