Just because we are praying and doing good today doesn’t mean we will be praying and doing good in the future. For example, those that were doing da’wah 10 years ago, few have survived. People that were once practicing, now no longer practice or no longer seek ilm (knowledge).
Especially those that aren’t married and aren’t working full time, these things will eat into a person’s life so they need to always be sharp and make the most of their time. They need to realise that life isn’t always the same and to be prepared for challenges.