Enter LMA2004A in the 'Enter Name' section of LMA Manager 2004 when starting a new game, then activate or deactivate by selecting 'yes' or 'no' in the 'Bonus Codes' area of the 'Options' section.

Unverified. If your user ID code isn't 7037, keep restarting until it is. These codes may be input for your name if your ID code is 7037:

LMA2004B - Fast players
LMA2004A - Players do not age
LMA2004IFFRFA - Cards are disabled
LMA2004UYRMJU - Player skills are maximized
LMA2004RKTLWO - Injuries heal in one day
LMA2004KCMUSF - Players bidded for always arrive
LMA2004YTNDDL - Stadium improvements take effect in one day
LMA2004XOYNPJ - Team tactics are optimally selected by the AI
LMA2004RSCQTN - Start with 500 million pounds
LMA2004XQYLSB - Bizarre gravity