The Best Is Yet to Come

This morning, while reading my email, a friend shared a thought that prompted this post. 
Often, in conversation, you may hear someone say "those were the good old days" or "those were the best days of my life".  I've heard these phrases, and I've said them.  But, I don't believe that!  Really, I don't. 
Here's what my friend said at the close of her email:

If you think your best days are behind you, they are.  If you think your best days are ahead of you, they are. ---C. Drost

Certainly, my life has been blessed, and the years to date have been wonderful.  Life has indeed been good.  I've enjoyed many wonderful times.  And I am thankful!  However, I believe the best days are yet to come!
Due to the fact that I need to get to work on time this morning, I can't explain my reason for believing the best is ahead.  So, I ask you....  Are your best days past, or do you believe the best is ahead of you?
Comments are welcome, and encouraged!