Do you take your friends out for their birthdays?

I’m friends with two other women and the three of us will occasionally go out for dinner. It’s been our habit to go out to celebrate our birthdays. The two of them have their birthdays in the same month, two days apart. One of them says it’s fine with her to do one dinner for the both of them. The other one says she wants each one to have their own.

To me, this is excessive, going out twice within a few weeks to celebrate two birthdays. It’s almost immature. If we were children, maybe it would be necessary. Maybe I’m becoming no fun, I don’t know.

What do you think?