Dreams about significant life events, such as birthdays, often symbolize personal growth, reflection, and the passage of time. Celebrating your 23rd birthday in the company of close ones suggests a desire for connection and support as you navigate this stage of your life.

The absence of your mother in the dream, particularly with the notion that she has passed away, may represent feelings of loss or a longing for her presence during important moments. This could indicate that you're processing grief or perhaps reflecting on how her influence has shaped you as you transition into adulthood.

This dream may also suggest a need to acknowledge the impact your mother has had on your life and celebrate her memory, even if she is not physically present. It could be helpful to explore your feelings about this loss and consider ways to honor her in your current life, perhaps through rituals, memories, or conversations with loved ones who can reminisce with you.

In summary, your dream reflects both a celebration of your life and an acknowledgment of the absence of someone important, highlighting the complexities of growth and loss.