Modric has no where to go again many player in his age range already retired but I think Realmadrid still needs him as an experience player so I think he's probably gonna complete his entire career in Realmadrid, he's a absolute legend.
I don't think it's about him playing with kylian Mbappe,I think they just found potential in him when it comes to big games so they would use anything to keep him from retirement.... until he's completely due for it
I don't think there is anything unique about experience in a game, he isn't the only legend Real Madrid has ever produced and they all have retired in peace, they have found something better off football that fetch them money but as for Modric, I think he wanted to stay by all means and Perez gave him a chance by signing a year contract and they maybe doing that probably they don't have the best man yet for his replacement, somebody young and talented.
If experience help players, I'm not sure Ronaldo would lose that penalty that in their Knockout stage for Portugal, he weep his eyes all through he match and was pet by his team mate not to cry, this is happening because Ronaldo is old, he can't be like his prime anymore, anything his doing now is just struggle to fit into a place where he is not supposed to be for that time. I hope Modric don't disappoint the team like that too in the end.