Here is a sample prayer for someone on their birthday that you can use as a guide:
Dear God,
I lift up my friend/family member on their birthday. I thank you for the gift of another year of life for them.
I pray that you would bless them on this special day and throughout the coming year. Please give them your wisdom and discernment as they make decisions and face new challenges.
I pray for your protection and provision for them and their loved ones. Please bring them your peace and joy, and help them to trust in you.
Thank you for your love and grace. May they strive to honor you in all that they do.
Amen.