Whether Prophet Khidr is still alive is a matter of differing scholarly opinions within Islam. There's no single, universally accepted answer.
Conflicting Perspectives
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Those who believe Khidr is still alive: Many mystics and some scholars cite narrations, like Abu Ishaq's account of Khidr's meeting with Dajjal (the Antichrist), as evidence for his continued existence. They often point to Khidr's unique status and divine favor as reasons for his prolonged life. Several online forums and discussions (reddit.com, shiachat.com) reflect this view. Some believe he is alive but at a different level of existence.
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Those who believe Khidr is not alive: A significant number of scholars, however, consider more reliable narrations and verses from the Quran to support the conclusion that Khidr, despite his exceptional qualities, was a mortal human being who passed away. IslamQA and Dar al-Ifta present this perspective, emphasizing that while Khidr's story highlights divine grace, it doesn't necessarily imply immortality. The preponderant view, according to Islamonline, is that Khidr is deceased.
Conclusion
The question of Khidr's continued existence remains a matter of faith and interpretation within Islamic scholarship. While some believe he lives on, others argue he is deceased. The Quran itself does not explicitly address his mortality.