age shouldn't be a problem as long as you have qualifications, i.e. your +2 certificate, TOEFL/IELTS/SAT, etc. if I were you, i'd look at some colleges first and contact them stating your interest of pursuing undergrad education. tell them what you've been doing during these years (between your +2 and now). i'm sure they'll let you know what you need to do.
good luck!
and stay away from consultancies, you can do all on your own and will save tons.