But someone will ask, "How are the dead raised? With what kind of body do they come?"  You foolish person! What you sow does not come to life unless it dies.  And what you sow is not the body that is to be, but a bare kernel, perhaps of wheat or of some other grain.  But God gives it a body as he has chosen, and to each kind of seed its own body.  For not all flesh is the same, but there is one kind for humans, another for animals, another for birds, and another for fish.  There are heavenly bodies and earthly bodies, but the glory of the heavenly is of one kind, and the glory of the earthly is of another.  There is one glory of the sun, and another glory of the moon, and another glory of the stars; for star differs from star in glory. 1 Cor. 15:35-41 (ESV)
To this day people question as to what kind of body they will have in heaven. If one dies as a baby, are they doomed to be a baby in heaven? If one dies in old age are they doomed to have an old body in heaven. The answer is no. We cannot know the full extent of what our body will be in heaven. But it will be a mature body, that has not aged with effects of sin. It will be a glorified body, different than the body we have now. It will be without sin. Sin effects even the outward appearance of our body, as we step closer and closer to the grave day by day. We lose our sight, our hearing, our skin wrinkles, our bellies bulge, our joints give way. This is all caused by sin, and leads to death. But when we are raised God will give us a body of his own choosing, a body of which our current body is nothing but a seed sown in the grave. We will see better, hear better, have perfect skin, taught bellies, and be able to run faster and further than ever before. It will be a heavenly glory, of which earthly glory can hardly be compared.