A birthday can be seen as a serious or joyful time depending on one's age and one's attitude towards life.
Another year has passed and we look back on failures and successes.
We think about our goals for the future and reflect on the past year.
These are all thoughts that may came up on a birthday,
but the main thing is to use a birthday as an opportunity to celebrate life and be joyful for the chance to be with friends and family.