“And as he was going out onto the road, a man ran up to him​.” The record of the rich young ruler is in Matthew 19:16-22; Mark 10:17-22, and Luke 18:18-23. It is Luke who tells us that the man was a ruler.
“life in the age to come.” This is the everlasting life that begins with the new Messianic Age, the Millennial Kingdom.
[For more information, see Appendix 3: “Christ’s Future Kingdom on Earth.”]