What games have been on your wishlist the longest?

Clandestine (9/18/2015)
Dead Secret (6/29/2016)
Tokyo Dark (9/9/2017)

My oldest ones added are:
"Ephemeral -Fantasy on Dark-"
"The Medium"

Forget Me Not: My Organic Garden, Added: 2015-10-26

LEGO® Jurassic World, Added: 2016-02-06

Assassin’s Creed® IV Black Flag™, Added: 2016-02-06

2 games added in 2013 left on it:

Gone Home
Batman: Arkham Origins

Added a bunch of HOGs in 2022, then Sun Haven is the oldest.

Cyberpunk

Silksong!... I was thinking.

No, actually it's Space Engineers from Dec 2015.

Vampire the Masquarade Bloodline 2 since 2019... and I will probably never have chance to buy it, missed option few years ago when steam was selling preorders.

L.A. Noire, Fable Anniversary and Hurtwold, all added late 2015.

The Witcher 3: Wild Hunt
Added on 13/06/2015

• Mount & Blade II: Bannerlord (added 15.07.2017)
• Mashinky (added 07.10.2017)
• After the Empire (added 25.11.2017)

• Dungeons & Dragons: Chronicles of Mystara (Jun 18, 2013) [Want a discount on the 4 pack which stopped getting discounted... D:]
• Oneshot - own on itch, I think, but want on Steam (January 19th, 2018) [Heard good things, but I like to track my stats and achievements so some platform it is]
• Rimworld - October 18th, 2018

Rimworld is a dream game, but a bit too expensive for the majority of the expansions so I will wait.

Apparently this one, added 10 years ago last January.

edit:
I only read the subject. Here are the next 2:
https://store.steampowered.com/app/261960/Cube__Star_An_Arbitrary_Love/ (Valentine's Day, 2014)
https://store.steampowered.com/app/235980/Tetrobot_and_Co/ (Also 2014)