But they wouldn’t be exactly the same.
The conceit of older ROs is that they have more life experience, have had more time and opportunities to experience life and love and death than a younger character. There’s just many stories you can do with an older character that you simply can’t with a younger one.
If they’re a widow(er) their romance route could be angsty af because what if they feel like it’s a betrayal of their previous spouse?
And yes, you could try to do the same thing with a character who’s 25, but it wouldn’t quite compare to romancing a 45 year old who’s already spent over half their life with someone they thought they’d spend the rest of their life with. A death early in marriage is depressing, but a death only halfway through one’s life is just tragic.
There are other examples but I really, really ought to go to bed. Sorry if I don’t reply for a couple of hours!