Dear friend
Unless we have been to heaven and seen with our spirit, we can honestly say that we do not know. Some theologians have speculated that all souls and after the resurrection of the dead at the end of time, will possess a glorified spirit and body of the same age of Christ Jesus when He died, 33 years old.
We don’t know though. As God is eternal and not subject to time, age is not relevant, age is only relevant to humans living within it.
In my own poor and amateur way, I have speculated that we will possess a timeless spirit, living in eternity with God, this is hard to perceive in the finite mind, however the glory of the resurrected spirit and body will reflect the life led, the repentance, the faith and love of God and others and the rewards justly gained for good works, by God’s Mercy. Age is not necessarily relevant in the eternal.
The apostles did not recognise Jesus at all in His glorified resurrected state. This means two things, He fully took on broken humanity and ‘aged’ within it, but once resurrected He posessed humanity in it’s eternal state and thus was unrecogniseable to them, possibly because they were still living within broken humanity and also because He was truly eternal in His humanity they could not ‘see’ who He was, until He granted them the grace to recognise Him.
Interesting question though and I hope and pray we all find out when we go to heaven, by God’s Mercy.
God Bless you and much love and peace to you
Teresa