A shared weekend with my 90 year old self? Certainly, if I will even live that long. If I would meet my 90 year old myself, then I would learn so much about the future that I could change the financial situation of both myself, and my family members, and friends too. Probably this is the best choice from the listed options. And even if you are rich/wealthy, you could still learn many things.
I will be 30 years old on 2022.09.17, but if I could go back five years, I would do many things differently. I would do everything to save our own house, so I would not have to suffer with rent years later, including the present. I am in front of moving again, and theorerically I will not have to pay rent in the new house. Soon I will see. And I will see other things too.
Either way, I would do many things differently in the past. Especially as a child (approximately 20-25 years ago). Including spending more time with my mother. Being more kind to her. Being more helpful to her. I was very far from a good child. My mother did everything for me and for my brother. She would have deserved much better. Both from me and from life itself too.
I have a lot of regrets about my behavior and about my actions. And not just/only in my childhood age, but as an adult too. I am trying to be(come) a good person.