So far we've only seen one method of Worldhopping, via Perpendicularities. The Surge of Transportation can do that too, that's how the Shadesmar map was plotted but without a method to get the spren off-world that's not true Worldhopping as they were merely in the space between worlds, looking in from the edge.
As for the seemingly agelessness among them, various methods are being used by various different Worldhoppers. Some have long lifespans, some are experiencing time differently, some are truly immortal, some are various mixes of various different powers.