"Long Life", Genesis 5 - Ted

Scripture: In Genesis Chapter 5 the Family Tree of the Human Race is outlined.
Adam Lived 930 years
Seth, Son of Adam, lived 912 years
Enosh, Son of Seth lived 905 years
Kenan, Son of Enosh, lived 910 years
Mahalalel, Son of Kenan, lived 895 years
Jared, Son of Mahalalel, lived 962 years
Enoch, Son of Jared, lived 365 years (because he was taken by God before death)
Metheselah, Son of Enoch, lived 969 years
Lamech, Son of Metheselah, lived 777 years
Noah, Son of Lamech was 500 years old when he had Shem, Ham, and Japheth.

Observation:  I've always wondered why the first sons and daughters of Adam and Eve lived such long lives.  After reading the first few verses of Chapter 6 it seems clear that God basically wanted to populate the earth.  Somewhere during the time of Noah God decided he wasn't going to breathe life into men and women endlessly so he set a new expected age of 120 years.

What I don't know is will this number change again by God as we read on or is 120 years still the standard only to be cut short by what man dose to himself by free will?

Prayer:  Lord, may I follow your ways and live a long and healthy life.  As a side note, I believe Robin and I will die at the same time at 114 and 115, she is a year older.  We have had these numbers since we were dating more than 10 years ago.