An elder in my church said that he was praying on this and had/received the thought “Remember yourself young and strong.” And got the image of a deceased lady in our congregation who died crippled and with replacement knees to suddenly being transform into a beautiful young woman and go dancing up into heaven.
I figure that God wants us whole, with original parts/limbs, and no longer crippled with age and infirmities. And for those who want to know where in the Bible it says that, I don’t know if it does, I figure a merciful God would want us to be at our best in his presence.
As for their health, I take the example from Jesus: when He rose and appeared to His Apostles and Disciples, He showed them His Hands and Feet; He had Thomas put his fingers on His Side. He did not mention the Holy Wounds inflicted upon His Head when crowned with thorns, nor His Body, wracked by the Scourging and the Roman soldiers beating Him. Just those Five, which identified Him.. . Just a thought.