Who is the most popular runescape player?

The Old Nite, he was the most respected as well even more than Zezima ever could be, In-fact The Old Nite made Zezima look like a bot, but a while back he passed away with cancer, that's where Zezima took his place as champion for a short while.

You need to be older than 63 to claim to be the oldest. And I know of a very active RS player who is 67.