If you were born in 1978, you are 47 or 48 years old in 2026 (depending on whether your birthday has passed). Born in 1978 age: 48 years.
Born in 1978: you are 47 years old before your birthday in 2026, and 48 years old after. Generation: Generation X.
If born in 1978, you are 47 or 48 years old in 2026.
Born in 1978: Gen X.