You caught me here. My birthday is on the 21st of June in most of the years, so it's more like four months for the N64. I knew that the GC launched in may (on the third if I remember correctly) and I knew that the N64 wasn't out for too long when I got it, so I just assumed it was also released in april or may.

For the record, my other consoles too (but I'm not too sure about them anymore)

GB: summer '94 (I got it for our vacation in Tuscany together with Wario Land, and I couldn't figure out how to beat the first boss the whole two weeks we spent there!)
SNES: '94 or '95, really not sure
GBC: first christmas after launch, I think it was released in summer.

well snes i got pretty late in the gen(i was young) ps1 pretty early in its life,Gc middle life,ps2 last year and wii this year early in its life.
so thats early to mid in there life

I usually pick up my console of choice around the time it's launched, to show my un-dying support :P, then about 3-4 years down I'll pick up another, however, my last 2 consoles were the Playstation and the PS2, and well.. I kinda never ran out of games to play ._.; my roomates usually pick up something though :P My roomate has owned a 360 from launch.

Game Boy - I can't remember
Game Boy Advance - A year in
Nintendo - A few years in
Super Nintendo - A few months in
N64 - Launch
Gamecube - Launch
PS1 - 6 years in O.o
XBox - 3 years in
DS - Launch
Wii - Launch (14 hours camping out)

Note: I bought the Genesis and Gamegear a while back from yardsales, but I don't know how far they were into that generation at the time.

only one ive bought on launch is 360

ive owned a SNES N64 and PS2 before that beside handhelds

Sega mega drive/genesis-1994 $150 Australian
Sony ps1 1997 $300 Australian
Sony ps2 2005 used $200 Australian
x-box 2005 used with heaps of games $500 Australian
Sony ps3 2007 $650 Australian

Xbox 360: Soon after launch
Wii: Soon after launch
PS3: Soon after launch
DS: Soon after launch
DS Lite: Summer 2007
PSP: Soon after launch
Gamecube: Soon after launch
PS2: 2002
Xbox: 2005
GBA: Soon after launch
N64: Soon after launch
PS1: Soon after launch
SNES: I don't remember

The Snes and Wii are the only two consoles i've purchased close to launch (month or 2 after launch basically at full RRP) but every other console when the price has reduced sufficientley (about £100-£150) near the end of the consoles life cycle, where it then has a solid library. Of course I freeload of friends and family while waiting to make my purchase. funnily enough my brother has bought a 360 close to launch im waiting for the ps3 to drop sufficiently in price (i guess im gonna wait till it dead) cus its still at £299.99

Hmmm... Let me try to recall this order:

Atari 2600 - A year or two after launch'
Atari 5200 - Launch
NES - A few months after launch
Gameboy - First Christmas after launch
Genesis - About a year after launch
SNES - Several years after launch
N64 - Six months after launc
PS1 - A year and a half after launch
Dreamcast - Launch
Xbox - Launch
PS2 - Two years after launch
GC - Three years after launch
X360 - Year after launch
Wii - Month after launch (later sold)
PS3 - Six months after launch (co-purchase with friend)
DSL - Four months after Lite Launch
PSP - A year and a half after launch

Whew... I think that's everything.

The plan is to wait for a price drop. $200 or less for Home Consoles. Until then I don't even consider it in the running. Usually demand dies down within the first year and console makers drop the price to spur demand.

Wii - Preordered, then picked up at launch. Yeah, this contradicts what I just said. But 1) my roomate was really interested in the Wii and was willing to split the cost with me at $125, w00t. Then my neighbor suggested we camp outside a Gamestop so we could get a preordered. Bless their lucky stars for convincing me to break my routine. I'd still be waiting for a pricedrop, lol!

DS - I waited about a year, right before Kirby Canvas Curse and Advance Wars DS came out. None of the games interested me before then.

GC - 6 months after launch. Nintendo quickly planted a pricedrop and I was still a Console Fanboy and avoided the PS2.

PS2 - 3.5 years after launch. Told ya I was a Fanboy. I bought it at a flea market with 2 controllers for $110. Sadly there it had the dreaded Disc Read Error. On the plus side I looked up how you could fix it (rotate this single gear 3/8 of the way? And Sony had to get sued to fix this? LOL) And I was in business.

GBA - 6 months after. Some good games popped up at launch and the backwards compatibility with my GBC library made it a no-brainer.

PS1 - 3 years after. The flea market...yeah good times.

N64 - 1 year after. My cousin and I split the cost.