There's been alot of posts lately about how many balls one buys a year, etc.  Granted I've bought some new ones this year, but I have 5 others that I still have a great use for. The "oldest" one I still use is a Track Mean Machine.  It was released 7/06.
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Does it really matter?

Brunswick Sapphire Zone-my favorite

I carry come real relics.

Pearl Aftertshock.....1995, I think
Boss Solid.....1997


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http://www.nationalbowlingstore.com/home.asp

My bag:
Aftershock Pearl (semi-retired)
Boss Solid (hate this ball, but it works)
Rock-On (for sale)
X-Factor (test driving)
Break Pearl (jury is still out)

On the way:
Awakening

Ebonite TPC Shooter.  Approved Dec. 2002
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It's all about J.A.C.C

Just A Carry Contest

Why is there more oil in the parking lot then on the lanes I bowl on?

Bowl To Win.

I from time to time still throw my Burgundy Hammer.
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If I ever saw an amputee being hanged, I'd just yell out letters.  --DM

Columbia 300 U-Turn Pearl. I still have two but the pin down one gets used quite a bit during the Sunday morning pot games.

I still use my Brunswick ShockZone, Demolition Zone, and Battlezone Bullet.

I threw my 300 game last year with my lime green Columbia Messenger.

And in my most difficult house that I bowl in, I 've gone back to throwing my old Columbia Cuda/C, with success.
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Duct tape is like 'The Force'. It has a light side and a dark side, but it still holds the universe together.

Some days you're the bug some days you're the windshield.

My low rev rate and higher ball speed combined with bowling on heavier volumes of oil means I usually do better with newer, stronger equipment.  The oldest thing in my bag is a Spit Fire, and even that rarely gets thrown.  Everything else is actually current-line equipment (Dimension, Gravity Shift, Cell)