Heaven is only the intermediate state between death and the resurrection. The righteous will live on the New Earth, which will be something like the Garden of Eden, only glorified, and their resurrection bodies will be glorified as well.
My guess is that the person will appear to be in the prime of life, and will wear clothing. Jesus was about 30 years old, and wore clothing apparently during his post resurrection appearances.
No one knows the exact details, though, other than there will be no more tears or sorrow or dying.
I Cor 15 says that God gives them a body that will please him, so it will be a body that is pleasing to look at. I doubt if he wants to look at your current fat rolls for eternity, and neither would he want to look at mine