"I am come that they might have life, and have it more abundantly."
Jesus, in John 10:10
"The Spirit is life because of righteousness."
Paul, in Romans 8:10
The phrase, "eternal life" does not refer, in the main, to a length of life; time is irrelevant in eternity, and so "length of life" is meaningless in eternity. "Eternal life" refers primarily to a kind of life – God’s kind of life, which is holy, and good, and wise. If you would live forever, then you must simply live the kind of life that will last forever, God’s kind of life, without sin. Sinless life is eternal life.
The good news is that we can live God’s kind of eternal life! That is what Jesus came to make possible. "I am come that they might have life," he said, "and have it more abundantly." Without God’s kind of life, Jesus considered humans to be dead. When he saw a funeral, Jesus saw dead people burying other dead people (Mt. 8:22). That is how much greater, and different, God’s life is than man’s.