For a citizen to be voted into the House of Representatives, they need to have attained the age of 25 and above. A 27 year old citizen can therefore be voted in.
When it comes to the Senate however, that is a different case. Senators are to be at least 30 years of age to be voted in. This probably has to do with the fact that Senators are responsible for their state whereas Representatives are only responsible to their district.
