Dr. R.G. Lee's list of conversion excuses and questions

31. Excuse

"I may be punished but not eternally."

Answer: If God is eternal and heaven is eternal-Hell will be eternal also. 

“Then he will say to those on his left, ‘Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels." (Matthew 25:41)

There is a "resurrection of damnation" 

“Do not be amazed at this, for a time is coming when all who are in their graves will hear his voice and come out—those who have done what is good will rise to live, and those who have done what is evil will rise to be condemned. (John 5:28-29)

Don't forget there is the second death. 

The sea gave up the dead that were in it, and death and Hades gave up the dead that were in them, and each person was judged according to what they had done. Then death and Hades were thrown into the lake of fire. The lake of fire is the second death. Anyone whose name was not found written in the book of life was thrown into the lake of fire.  (Revelation 20:13-15)

32. Excuse

"I am to old to become a Christian."

Answer: There is no age limit. (2 corinthians 6:2).

God has forseen your problem. 

But if from thence thou shalt seek the Lord thy God, thou shalt find him, if thou seek him with all thy heart and with all thy soul.When thou art in tribulation, and all these things are come upon thee, even in the latter days, if thou turn to the Lord thy God, and shalt be obedient unto his voice;

(For the Lord thy God is a merciful God;) he will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which he sware unto them. (Deuteronomy 4:29-31)