cumpleaños
birthday
cumplir
to complete
+
años
years
Cumpleaños means birthday and combines cumplir0 (to complete0) with años1 (years1), literally meaning 'to complete years'.
noun
- birthdayThe anniversary of the day on which a person was bornHoy es mi cumpleaños, cumplo 30 años. // Today is my birthday, I'm turning 30.