I've been dabbling with something about Next Gen vs. the Millenial Gen. I mean, Next Gen is much better than the Lost Gen, and to be fair they've still had to deal with late prime Novak and Rafa (and Roger, a bit). But yeah:
Slam finals:
Players born 1989-93 (Lost Gen): 1-5 (Thiem 1-3, Raonic 0-1, Nishikori 0-1)
Players born 1994-98 (Next Gen): 1-14 (Medvedev 1-5, Zverev 0-2, Ruud 0-3, Tsitsipas 0-2, Berrettini 0-1, Kyrgios 0-1)
Players born 1999-03 (Millenial Gen): 4-0 (Alcaraz 3-0, Sinner 1-0)
For Next Gen, 15 Slam final appearances, only one title. Hey, at least they've been reaching finals - Lost Gen only made 6, and Thiem arguably belongs with Next Gen (then it would be 0-2 vs 2-17).