In fact it is very near the average age of law students entering law school today. Only one third of all law students have come directly out of an undergrad program. Two thirds have been out of undergrad for a year or more, and I personally didn't start law school until I was 26. That is because the program is intense and academic success depends on being able to devote your full time to your studies. During your second and third years of law school, you are permitted to work up to 20 hours a week.
Most law students work full time during the summers, between their law school years.
And you can often make quite a bit of money doing this. If your financial circumstance require you to work throughout law school, you should seriously consider a part time program. A law school financial aid package will be based primarily on loans although all law schools also offer some grant and scholarship aid. Through the federal loan system, every law student is entitled to borrow up to 18,500 dollars per year, regardless of need. Beyond that there are private loans, grants and scholarships to further assist law students financially.