Young-un here but I'd say make sure you're doing it because you love the subject. That way,
1. You'll smoke us unmotivated jaded teens in marks and career opportunities.
2. You'll be able to put up with all our immaturity when you're forced to group with us for projects.
I have the highest respect for "mature" students who have figured out what they want in life. I have none for those who are just dabbling around instead of facing the world.
Regarding career, same suggestion. At 29 I think the only doors closed are ballerina, runway model and football star.