Somebody told me that if you keep putting something into the reset hole on the back of your Tamagotchi and you keep seleting download it will be a Adult at 0 years old. Hope this helps.
Just remember a debugged tama is verry different from a non debugged tama.
Also it helps to not pause your tama, if you really need to pause it but you still want it to grow, then I suggest stting the time ahead to it's bed time and letting it sleep instead of pausing it, that way it can still grow. But you really can't cheat the process.
But with the older tamas you can. All you have to do is set the clock ahead to your charecters bed time, they should fall asleep. Then you have to set the clck ahead to a time when you know they are awake, they should have aged a day. you can do this over and over and it shouldn't hurt your tama. It will make it older faster but it won't make it grow faster