No idea RE: your chances without grades and LSAT but your age is pretty normal. The most typical 1L age is probably like 22 or 23. If you got in first try you might be about two years older than the generic 1L. No big deal.
It is not possible to say without an LSAT score, as it stands people that do mediocre in undergrad generally do not get accepted to law school. But if you do exceptionally well on the LSAT then you will likely get accepted somewhere.
Your background is likely to be irrelevant for admissions purposes.