a little older, somewhat grown-up
Ocurre que ya soy mayorcito y no necesito obedecer sus órdenes.
The thing is, I'm old enough now and I don't need to obey his orders.
— Fresas salvajes (1957)
Eres lo suficientemente mayorcito para enfrentarte a tus propios problemas.
You're old enough to deal with your own problems.