A night out with friends

This evening I had a lovely evening out with my three IKEA friends. We have all worked together in various stores and roles and have been friends for over 20 years. There is nearly 30 years between the oldest and youngest but we all get along so well together. It was great to have our second catch up this year - normally we only meet once per year, but last week it was someone’s 50th birthday so we had to go out to celebrate. Can you guess which one of us was 50?