For we are brought to an end by your anger;Here the Psalmist makes a connection between the length of our days and the wrath of God. This is an interesting connection, but just consider that first phrase, "For we are brought to an end by your anger;"
by your wrath we are dismayed.
I know that we are in modern times and only those backwoods mountain preachers still talk about God being angry, but we are only reading the verse. We (as humans) are brought to an end by God's anger.
I suppose that this could be referring to the curse of sin. After Adam sinned, part of the curse would be that he would die, but God (in His grace) banned us from the tree of life. I believe that He did not want us to eat of that tree, and end up stuck in this sin-cursed state.
I believe, though, in this Psalm, that the anger of God shortening our days is an overall statement. We are still sinners today, and especially as a whole group (the entire human race) we arouse God's anger over sin, and He shortens our days.
The second phrase in this verse is almost a restatement of the first phrase. In fact, that word dismays carries with it the idea of hurries. His wrath (burning anger) hurries us along to our death.
Psalm 7:11 says, "God is a righteous judge, a God who expresses his wrath every day."
Whether you live up in the mountains or in a bustling metropolis, don't forget God's wrath. It just may have an affect on your days.