NES --> SNES --> PS1 --> PS2 --> Wii --> PS4 --> Switch

ColecoVision

*TRS-80 Color Computer 2 (filled the void during the North American Video Game Crash up to getting an NES in '88)

NES

SNES

PlayStation

PS2

Xbox 360

Wii U

Switch

I played with a lot of the mainstream retro consoles between the years of like 6-7. My dad and all my 6 older siblings were gamers so we ended up having Colecovision, NES, SNES, Genesis, Game Boy, N64, and PS1 before I was even born or around the time that I was just an infant. I was always drawn to video games and had played the aforementioned consoles here and there, TBH I watched my siblings play those consoles more than I actually played them. I didn't start gaming in earnest until the tail end of the 6th gen when my lil bro and I got the GameCube in '04 as a present, a few months later my older bro got the PS2 and I was hooked.

Main consoles I played on starting w/gen 6:

6. PS2 (even tho I love the GCN a lot more)

7. Xbox 360 (again I loved the Wii more lol)

8. PS4 (we don't talk about the Wii U...)

9. Switch (my series S is getting a lot of love recently tho)

Handheld consoles:

6. GBA (was my older brothers, let me have it after he was done with Pokemon Ruby)

7. DS ( I may have played this more than the 360 actually)

8. 3DS (Vita was great too!)

9. Switch (Again!)

You won't like it.... Oh boy, you won't like it.

1. SEGA GameGear
2. SEGA Genesis/Mega Drive
3. PlayStation
4. Nintendo 64
5. Game Cube

*Owned PlayStation 2 in summer 2003, but immediately collected heavy dusts*

6. PC
7. Xbox

*Owned PlayStation 3 in early 2007, but immediately collected heavy dusts*

8. PC (again)
9. Xbox 360
10. Nintendo DS

*Owned Nintendo Wii in summer 2009, but immediately collected heavy dusts because for playing GCN games only*

11. PC (again)
12. Nintendo 3DS
13. Wii U
14. Xbox One

*Owned PS4 in 2015 for Bloodborne, but.....*

14. Back to Wii U for Splatoon
15. PC (Yeah, i know it's getting old, but this time it's because of Doom 2016 and Overwatch)
16. Switch & PC together

EDIT

*Oh yeah, i owned both Xbox Series X and PS5 in the same year, however*

17. Switch & PC together (again)

1. NES
2. Genesis
3. N64
4. PS2
5. PS3
6. PS4
7. Switch (gen 9)

1) zaxxon laptop arcade + handheld football (early 80's)
2) atari 2600 (mid-80's)
3) NES (late-80's)
4) SNES (mid-90s)
5) N64 (at launch)
6) PC - (2000's - college years... only played Battlefield and Civilization games
7) NGC - (late 2000's)
8) Wii (at launch - also owned PS3)
9) WiiU (at launch)
10) Switch (at launch; original/lite/OLED)

I will list any console that I consider my main gaming plattform for that time period. I will also list some games I remember from that time. Games that had a lasting impression on me. Listed are the years that I started mainly using each system. I'm born in 1988 so ofc I did not play the NES back then but from the get go if I touch a controller it was hooked on to the gray box.

NES 1988 - A few friends and my cousin had the Nintendo. Was just a young child and used the game genie to get anywhere. My cousin had to help me set it up.

Notable games:  Super Mario Bros, Super Mario Bros 3, TMNT, Ice Climbers

SNES 1995 - My brother bought the Super Nintendo. First console we had at home. 

Notable games : Super Mario All Stars, Legend of Zelda a Link to the Past. Donkey Kong Country

PC 1998 - Pretty much skipped out on any console this generation and did not have any friends who owned a Playstation or N64. Gamed mostly on the families computer

Notable games: Sim City 2000, Warcraft 2, Starcraft, Diablo, Tyrian, Transport Tycoon, Heroes of might and magic 2 and 3

Gameboy Advance 2002- The first system I bought with my own money as well as the first system I did not have to fight my siblings for playtime on.

Notable games: Mario Kart Super Circuit, Fire emblem, Advance wars, Pokemon Crystal, Legend of Zelda oracle of ages/seasons (did not have a Gameboy color, so I played some older games on the GBA as well)

GameCube 2004 - Me and two of my siblings bought the Gamecube together. It is probably the system I have my most beloved memories with, we still play it on family reunions, bringing our own controllers. The Mario Kart and Zelda pack in for around 150$ is still the best new console deal ever imo.

Notable Games: Mario Kart Double Dash!!, Resident evil 4, Eternal Darkness, Donkey Konga, Super Smash Bros Melee, Zelda ooT/Majoras mask

Wii 2006 - First system bought at launch. Home to what in my opinion is the best version of the best game, Resident Evil 4, as well as my favorite in both the Zelda and Mario series. But also the first time I got really disappointed in an anticipated game when Super Smash Bros Brawl was released.

Notable games: Super Mario Galaxy 1 and 2, Resident Evil 4, Zelda Skyward Sword, Wii Sports

DS Lite 2007 - Ok, Here I will stray away thew "one system per generation" trope. DS lite is the system I spent most time playing on. It took over the top spot from Wii as my most used gaming system very fast. It sparked my love for Adventure games. But it also is home to the first Zelda game I did not like and it is the first system I broke. Even so, I still have an extra unused DS lite (My forth DS bought). I had a DS earlier but played a lot more when Lite hit.

Notable games: Phoenix Wright Ace attorney (all of em), Hotel Dusk, Another code two memories, Advance Wars Dual Strike, Pokemon Black/white

PS2 2009 - Since I moved away from my parents I had no console hooked to the TV, and as a student I got no money. Bought a cheap new PS2 at a time when PS3 had already released. Bought two full paper bags with used games for basically nothing, tried each of them and traded in anything I did not like. 

Notable games: Resident Evil 4 (worst version imo), Kingdom hearts, Ico, Okami

PS3  2013 - At the end of its life but before the PS4 got released I picked up a PS3. This was the first time I got a system just to play one game The Last of us. Got a lot of use out of it and it was probably my main gaming platform for the longest time.

Notable games: Resident Evil 4, The Last of Us, Uncharted 1,2,3, Heavy Rain

iOS 2018- Yup, my mobile phone was at a time the system I used for playing most. At this time I had a PS3, WiiU and 3DS all hooked up ready to be used. But even if the 3DS was portable, I did not bring it everywhere like with the iPhone. Got my adventure game fix and fell in love with the auto battler genre. 

Notable games: Angry Birds, The walking dead, Solomons keep/boneyard, Candy crush saga, Pokemon Lets Go, Teamfight Tactics (I did play Resident Evil 4 on it as well, sadly)

Switch - 2020 If this was the only system I got to keep and play on for the rest of my life, I would be content. The backlog of games I still got to play is so large that I will not have time to scrape the surface. I've got myself a PS5 as well, but so far the top spot is secure in the hands of the Switch for a foreseeable future.

Notable games: Tetris 100, Super Mario Maker 2, Super Smash Brothers Ultimate, Mario Kart 8 Deluxe, New Pokemon Snap, Resident Evil 4

I love how you played RE4 on everything.

NES
SNES
PS1
PS2
PS3
PS4
Switch

Gen 2 - Atari 2600
Gen 3 - None owned at the time (played NES and Master System equally with friends/family)
Gen 4 - SNES
Gen 5 - None owned at the time (played N64 and PlayStation equally with friends/family)
Gen 6 - GameCube
Gen 7 - Wii (also owned PS3 and Xbox360)
Gen 8 - Wii U (also owned PS4 and Xbox One)
Gen 9 - Switch