Lots of big trees down your way, Butch!! I'm sure they grow even faster than up our way, due to the warm, wet climate you have.
I've cut a 120 foot poplar that was about 25 yrs old, a 30 yr poplar that was close to 4 foot dbh, and a 50 yr black cottonwood that had 2500 board feet in its bottom 50 feet. The butt was 5 feet and over 6 at the dirt level. The "baby" giant sequoia that hosted the '02 ITCC speed climb is 140 feet tall, 100 foot crown spread, and 11 feet in diameter at ground level, over 9 feet dbh. At most it is 120 yrs old! Some urban doug firs are under 80 yrs old, pushing 140 feet and 4 feet dbh.
How about some examples of big trees in your bailiwick... fast growth, young or old.....growth ring size etc (I've seen well over 1 inch annual growth on some.