Hey I'm a bit late here but I can give you my personal experience. It is quit the contrary of what your expectations seem to be.
I did 3 years CEGEP and a 4 year Undergrad (just because I took my time). I spent some time managing a restaurant, then started a law certificate in the evening, then law school. I thought I would be disadvantaged because my background was so far away form the classic path to Biglaw. I will be 28 when graduating.
I just did my Course aux stages and got 4 offers, while having a 3.65 GPA. First, they don't care about your age. If you have done anything productive in the past 10 years, it will be a great advantage to you in the interviews, because you might have more to say than anyone else. Find a way to highlight your maturity/leadership or whatever it is you have developed while others were in high school. I had a lot of misconceptions about a supposed prejudice towards older candidates, but I can assure you they don't really care. Get involved in whatever gets you going and be passionate about something.