@ adolite.
my bro age does not matter. just go there with one mind.if  you are asked about your age just tell the v.o.
but on the undegraduate issue be ready to answer questions on your secondry o levels subjects like when did you garduate from secondry school and what have you been doing since then,expalin the course you are going for and what is the relivance to your contry,where can you work with it,what area are you going to major in.who is paying for your studies.have you travelled before.be ready to answer questions like that at the lagos consulate. i was asked thoes types of questions during my interview.