Past, present and future

It has become apparent that the older you get, the more things start to run together, as far as time and experience goes.  It's easy to lose track of what happened and when.  Something that may seem to have taken place only a year or so ago ... it turns out that it happened five or more years ago.  Gosh, it sure doesn't seem that it was THAT long ago.

Is it a function of a "hazy brain" and do we just lose some of our mental acuity as we age?  Or is our brain only capable of retaining only so much information and memories and the like? 

Is the way that those stories and memories are imprinted so imperfect and an eventual blending is inevitable? 

Or is it just me?  I feel as though I only remember so much and that even those memories that seemed so impervious are now starting to fade.  Or is it a question of priority?  Perhaps what I used to consider a precious memory is now only a fleeting thought, making room for new memories and images that are deemed more important or vital.

All the more reason to record thoughts, ideas, feelings and experiences so as to retain and preserve them.  Some minor insight in the past or present may find new luster in the future.