I think it ends, when it is stop having relevance in the market. So every developer is mostly making games for the newer gen. But that does not means all the other consoles can not continue to sell great.

I can agree with that. Have a good day because off to work I go.

Probably no adjustments needed of ~62m total. The number produced and sold after mid 90s was probably very small.

Wiki has 61.91m from a Nintendo Japan link. Link doesn't seem to work but 61.91 is probably the final number pulled from a Nintendo financial statement.

When Nintendo says so.

Or whenever the first "next-gen" console gets released. Take your pick.

When there are no more quality titles and the final console sells nothing but ports from other consoles, that's when I think the generation is over.

Think of when the PS2 released. The PSX was still getting titles like Dragon Warrior 7, Breath of Fire 4, Final Fantasy Origins, Arc the Lad Collection, Mega Man X 6, etc. When the PS3 released, PS2 was still getting titles like God Hand, God of War 2, Persona 4, Persona 3, Budokai Tenkaichi 3, Yakuza 2, .hack//G.U, etc, etc, etc.

The PS2 kept getting good games well over a year.

The PS3 for sure and maybe the 360 will keep getting exclusives well past their releases. Hopefully Sega gives us fans in the US Yakuza 5. Yakuza 2 came out in 2008, almost two years after the PS3, so there's always hope.

I look at it as going from black to white along a gradient of greys. So, it is subjective to a point as how dark or light the grey is before it is black or white to the point no grey is left.

Right now we are in dark grey territory on consoles with all three of previous generation selling and one new generation also selling. Once we have all three new this year we will be at mid grey as it lightens with support and sales for old declining and new ramping up.

A gen ends, if all the consoles of the gen are discontinued. Retro-editions don't count.

The new gen starts, if the first new console is released.

Yes, I'm aware that this means, that two gens can be happening at the same time. But in human society also different generations live together.

I agree 100% with this stance.  Generations overlap and as long as you can keep the consumer interested in that product you deserve to have those sales counted.  A 7 year old system selling against superior competition at a lower price is just as impressive, if not more so, as it selling in its prime.

My vote is a generation ends when all systems of that generation are no longer beings old are produced. Just because a "new" gen starts that doesn't mean the old one has ended. Even when used to fit some peoples' Personal" agendas it is still true.

But in all honesty it really isn't that big of a deal except when people use it to argue their "opinions" lol.

The two most plausible is when all of them come out or all stops being made.

You could make an argument for either really. There is no right or wrong answer.