The Word says that as the unsaved person grows older, the heart hardens, less likely to embrace the Savior, yet Jesus spoke the parable about the laborer who was paid a full day’s wage though he worked only the last hour of the workday, clearly meant to give hope to those old and still unsaved. Of course rewards will be bestowed in heaven according to the works for the Kingdom done, so people saved for many years will have the leg up on that, although great works in Elohim’s eyes can be done quickly!