
There is no ballpark answer to it. Everyone has their own reasons for celebrations. People celebrate in a variety of way. Some play loud music while some go to temple.
Our born day is a major event to thank our parents especially. They have brought us to this planet. Thereafter our family members, friends and other well-wishers. It is a day for self-reflection. Observing the past and planning the future along with living in the present. Can look to the past one year and share the learnings with others.
People think inversely too. One has now one less year to live. If you think inversely, chances are high you won’t regret on your death bed. As you will be more focused with the limited time frame you are left with.
What are you gifting oneself on birthday?
One can sell an hour of time to oneself. We are so busy doing other stuff that we forget the things that we love doing. Do you remember what did you enjoy the most in your childhood? If you remember them, you can continue to do them more often. That would be best gift you will receive. If your birthday is approaching, you can execute the above ideas. Life will be more pleasing and colorful.
What about the return gifts?
You could look to relationship you had with that person in the past one year and how can you improve it more. As humans, communications are most essential for us. We need more of human touch in the digital age.