Hey Nairalanders, I’m 25 and I want to start my undergraduate studies afresh. I’ve completed National Diploma but I don’t want to use the result. Can I still go for undergraduate studies and what are the chances of gaining admission?

It's never too late to start new dreams. Personally I will advise you to go ahead and study for it. Else you will regret it at some time in the future. Even 60 years old can attend school all over again. There are a million and one people who would want to be in your position

This is dumbest question I've heard this year,. Lool.. even a 65 year old grandma can start school all over again if she wishes,.. there is no age barrier/limit on education!!

Yes, why not? However, there are two potential challenges that you may encounter on your way there.
1. Some schools may not find you eligible for their scholarships because these scholarships are reserved for students who have graduated from high school in the last two years and have not had any college education. Your OND puts you at a disadvantage here because even though you do not intend to use the result, you already have some college education. My advice to you here is to not mention it at all in your application.
2. Getting a visa may be a little challenging depending on the school you apply to. My advice to you here is to ace the SAT and apply to a good school (such as a flagship state university) and have good financial support. Also, prepare a few reasons for whatever you've been doing since you finished high school, because this may come up in your interview.
All else held constant, your age is not an issue.

The major question you will be asked is “what have you been doing all these years, after graduating from high school”

Your response has to be convincing o

Novartis:
The major question you will be asked is “what have you been doing all these years, after graduating from high school”

Your response has to be convincing o

.
Hi novartis

Queenslander:
This is dumbest question I've heard this year,. Lool.. even a 65 year old grandma can start school all over again if she wishes,.. there is no age barrier/limit on education!!

bro you told him everything, you can acquire education or skill at any age if you are determined.