Lot of people continuously buy the newest and latest ball claiming that the ball has died. The reaction is maybe a 1/4 of what it used to be, but i still carry around my black taboo. Whats the oldest ball you still use?

Nomad Solid

My two ball league arsenal is a Legends Black Pearl (2006) and a Legends World Class Reactive (2006). 

For short tournament patterns I still take my Slate U-Dot from way back when.

Track Desert Heat...still money on dry

I have a Massive Damage in my locker that I occasionally bring out.  It's one of those that I will never part with, along with my Avalanche Pearl Urethane.  Sometimes you run across a ball that looking back you wish you had bought a few more of...

Right now, since I've been playing on mostly med-dryish conditions, and I've noticed that there is a certain ball movement which carries best on those conditions....I've gone Retro and am using these:

Ebonite Savage: 2001; Brunswick Demo Zone: 2000; and an LT-48 Gold: 1998
Roto Grip Saturn: 2006  Roto Grip Ultra-Sonic: 2004; Azo Fantasy-X: 2002

I do have much newer equipment, but with my revs, and the low volumes I see, there's no pressing need to use them.

I think I sold that Ultra Sonic to you.

I still have a V-2 that I use occasionally.

The oldest bowling balls I carry consistently in my bag are my Fab Blue Hammer (dull finish) and Fab Burgundy Hammer (matte finish) that I bought in 1994. (The oldest piece sitting around in my closet is a Columbia 300 Gold Dot that I bought in 1989.)

The Blue Hammer, which I usually apply a 2000 grit pad to it, is used on house shots and sport patterns at 40 feet or less. The Burgundy Hammer, which I usually apply a 1000 grit pad to it, is used mostly as my spare ball. But I have used it on house shots and most recently on a 37-foot flat shot after the heads were already gone after 1 1/2 games bowled. Neither ball has ever been plugged and re-drilled.

For whatever it's worth, I've also used from time to time my Track NRg and Track Sensor II -- the latter is a personal favorite of mine. Both were purchased in 1995.  I did have the NRg plugged and re-drilled because the pin was too far away from my axis point; the Sensor has never been plugged and re-drilled.