Conversation

I want to be fluent in talking because I have difficulties expressing myself when I'm part of a group.
Yesterday, our tennis team members dined out together at a Taiwanese restaurant.
Nine members including myself came to the dinner.
I was the youngest among them and the other members are in their 40s, 50s and 70s.
Some of them talked about their younger days so I couldn’t follow their conversation at all.
They are much older than I am, so I couldn’t speak naturally so I just talked to my friends who are around my age.
But in order to enjoy talking with many people, I need to have more experience to talking with people who are not my age.