well what i have heard you need a v.5 tamagotchi and it should come with a code which you then login to tamagotchi town with it and play games and then if you win games they will give you codes for different things.
A Tamagotchi can be any age to connect.
yup.
You must either: 1) Buy another tamagotchi and connect the two 2) connect with a friend's tamagotchi
Yes, but niether of them can connect to a v4.5 or a v3.
no
Sadly, no. But V5 can connect with V6 (music star.)
You can't connect to another tamagotchi online you must connect in person. Other people on websites such as TamaTalk have researched this question, and have guessed that you might be able to connect online in the future.
You actually can't. But I do know that if you have a v3, you can get in without a tamagotchi.
only if one is an oldie or both
you I.R. connect it
Yes.
Yes.