Yes, I am in my late thirties now. In principle, it shouldn't be difficult to think about the things I liked in the past and accept that they are no longer there. For example, my grandma has passed. She was an amazing person and I loved spending time with her. I don't think about her every day, or even every week or every month. I live in peace with the fact that she is no longer with us. Yet somehow I miss my ex way more than grandma even when grandma had a way bigger role in raising me. Makes no sense. I like your point of view, I have no problem thinking about it from time time. That is manageable. When the thinking becomes craving it is when it becomes unmanageable for me.