More than 5 years have passed since the world saw credible pictures/videos of him alive. Since then, all claims of his still being alive have been backed by Al Qaeda who claim that they have had communications with him. These 'evidence' have turned out to be fiction at best, deception at worst. Now, a chief of Afghanistan's ousted Taliban militia, Mr Mansoor Dadullahsaid, has said that he received a letter of condolence from OBL over his brother, Mullah Dadullah's martyrdoom at the hands of US-led forces recently.
One thing Al Qaeda seem to be doing well is to perpetuate the myth that OBL is still alive. Given his penchant for showmanship (while he was alive), OBL seems to be uncharacteristically quiet for more than 5 years now. He can't speak for himself anymore - he appears in worn videos and he sends greeting cards and furtive messages from time to time. But he doesn't appear in person.
Conclusion: OBL is as dead as the stone in the mountains of Afghanistan. His memory, though, still lives strongly, continuing to bring a threat over mankind.