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My opinion is that we will all be around the same age as Christ was during His ministry on earth. We know from 1 Corinthians 15 that we will resemble Christ: 42 So it is with the resurrection of the dead. The [human] body that is sown is perishable and mortal, it is raised imperishable and immortal. 43 It is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in strength; 44 it is sown a natural body [mortal, suited to earth], it is raised a spiritual body [immortal, suited to heaven]. As surely as there is a physical body, there is also a spiritual body. 45 So it is written [in Scripture], “The first man, Adam, became a living soul (an individual);” the last Adam (Christ) became a life-giving spirit [restoring the dead to life]. 46 However, the spiritual [the immortal life] is not first, but the physical [the mortal life]; then the spiritual. 47 The first man [Adam] is from the earth, earthy [made of dust]; the second Man [Christ, the Lord] is from heaven. 48 As is the earthly man [the man of dust], so are those who are of earth; and as is the heavenly [Man], so are those who are of heaven. 49 Just as we have borne the image of the earthly [the man of dust], [j]we will also bear the image of the heavenly [the Man of heaven]. I believe babies and children who die before the age of accountability will be recognizable but they will be adults. My grandmother who died in her 90's after suffering years with a horrible, osteoporosis back will have a perfected body and no longer be old. We won't really know until we get there, and I know there have been testimonies of people having experiences of going to heaven and coming back that disagree with my opinion, but when we get to see Jesus it won't really matter. I also get excited about having a perfected voice that will be able to sing praises to Him for all eternity.
There is nothing in the Word that tells us what age we will resemble or wht we will look like but we will receive glorified bodies...if we were ill we will be healed.
I think the best answer is the one the apostle Paul gave in 1 Corinthians 15: "But someone will ask, “How are the dead raised? With what kind of body will they come?” How foolish! What you sow does not come to life unless it dies. When you sow, you do not plant the body that will be, but just a seed, perhaps of wheat or of something else. But God gives it a body as he has determined, and to each kind of seed he gives its own body. Not all flesh is the same: People have one kind of flesh, animals have another, birds another and fish another. 40 There are also heavenly bodies and there are earthly bodies; but the splendor of the heavenly bodies is one kind, and the splendor of the earthly bodies is another. The sun has one kind of splendor, the moon another and the stars another; and star differs from star in splendor. So will it be with the resurrection of the dead. The body that is sown is perishable, it is raised imperishable; it is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in power; it is sown a natural body, it is raised a spiritual body. If there is a natural body, there is also a spiritual body. So it is written: “The first man Adam became a living being”; the last Adam, a life-giving spirit. The spiritual did not come first, but the natural, and after that the spiritual. The first man was of the dust of the earth; the second man is of heaven. As was the earthly man, so are those who are of the earth; and as is the heavenly man, so also are those who are of heaven. And just as we have borne the image of the earthly man, so shall we[bear the image of the heavenly man. I declare to you, brothers and sisters, that flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable." In other words we will be ageless. We will no longer be living in time but eternity.
We will be like God created us before sin in their image, like Adam and Eve, clothed in glory in the likeness of God the Father and Jesus the son. (After Adam and Eve sinned they lost their glorified bodies and were naked.) Jesus could walk through walls and also eat and drink. We will be perfect, whole, youthful. (Aging is part of death and the curse of the law.) We are new creations in Christ Jesus.
I think the best example we have is Adam and Eve before their fall into sin. God created them as perfect human beings, at exactly the right age to populate the earth and have dominion over it. No physical defects, no illness, no aging. In this perfect state forever eating from the tree of life. But they ate the forbidden fruit and death entered our world; so did sickness, disease, aging and so on. Our physical bodies are racked with sin. Those of us who die before Jesus' returns will be nothing but the dust of the earth. We will receive new bodies like Jesus' imperishable body. In bodily form Jesus was recognizable to those who knew him so he obviously looked similar to his earthly appearance as a man. Adam and Eve had children. Had those children been born in paradise, I believe they would have grown up like any other human child and then reached maturity, when no further aging or development would have taken place. What about children who tragically die very young or in the womb? God knows what these children would have looked like had they grown to maturity so I believe he will recreate them in their perfect state of development. I also believe that we will all recognize everyone we knew in our human existence who believed in Jesus. We will also have the benefit of having the new name Jesus gives us written on our foreheads. Remember that the purpose of our resurrection bodies is to enable us to rule with Jesus when the New heaven and New Earth is created. For those who believe in a 1,000 year reign of Christ upon the earth, we will also rule with him in our resurrection bodies for the 1,000 years. Our resurrection bodies will be perfectly suited to what we need to carry out Christ's commands for all eternity on the New Earth which only believers will populate.
This is one item that there is no actual description of you resurrection body related to what you are now. However, you can relate to Jesus and his PHYSICAL resurrection when you can know what Jesus said in Acts that He was "FLESH and BONES" - not flesh and blood. He was recognized and ate as the others did in the gatherings of the Apostles that day.. We know this that DEATH has no power over you again, no matter how that flesh is created. This question is very hard for us to answer other than to know that you will be in a NEW physical form beyond anything we can at this point understand. Big question is the physical form of resurrection University capacity over all we can see in the sky which is restricted to us today, for you can not leave this world with no life support system protecting you. A lot more you can speculate on this issue but we know we will be known.
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