Although there is no explicit mention of Patrick's birthday in the cartoon, it can be inferred that he is about 37 years old according to his birth year and the usual age setting of comic characters. According to the information of his birthday on February 26th, it can be determined that his constellation is Pisces.
Pisces is the zodiac sign, and its date of birth is between February 19 and March 20. People in this constellation are usually intuitive, good at understanding and observing others, and have the characteristics of deep compassion and love. This may explain why Patrick always understands and supports Spongebob's adventures and crazy ideas, and their friendship is thus maintained.