Like Solomon said, sure, you need to remember Him now, but as for the wording of Ecclesiastes, you should seek God in your youth so that you don’t waste your life living for yourself.  Avoid all that regret and seek Him early in life.  That brings us to your final question before the checkpoint.  What is the whole duty of man, according to Ecclesiastes?

-Fear God and keep His commandments-

-Go into all the world and preach the Gospel-

-In all thy ways, acknowledge Him-

-In whatsoever ye do, do all to the glory of God-