There is no problem with having dual citizenship in any position in life.
Dual citizens can receive the benefits and privileges offered by each country where
they are a citizen. For example, they have access to two social services systems,
can vote in either country, and may be able to run for office in either country (if the
law permits). They are also allowed to work in either country without needing a
work permit or visa and can attend school in either country at the tuition rate
offered to citizens (versus the international tuition rate).
As a dual citizen, you are allowed to carry passports from both countries. For
example, if you are a U.S. citizen and also a citizen of New Zealand, you can travel
more easily between these two countries. Having a citizen's passport eliminates the
need for long-stay visas and any questioning about the purpose of your trip during
the customs process. It also guarantees the individual in possession of two
passports the right of entry to both the U.S. and New Zealand; this can be
especially beneficial if you have family to visit in both countries, or if you are a
student or a businessperson that either studies or conducts affairs in both countries.
Another benefit of dual citizenship is the ability to own property in either country.
Some countries restrict land ownership to citizens only. As a legal citizen of two
countries, you would be able to purchase property in either—or both—countries. If
you travel frequently between the two countries, this might be especially useful
since property ownership might offer a more economical way to live in two places.
As a dual citizen, you'll reap the benefits of being immersed in the culture of the
two countries. Some government officials are also fond of dual citizenship and see
it as a way to promote the country's image as a prime destination for tourists. Dual
citizenship offers individuals the opportunity to learn about the history of both
countries, learn two (or more) languages, and experience a different way of life.