As for how this deals with the limits of pleasure: many of the most intense pleasures that result in feeling "full vitality" happen from a removal of pain such as the pleasure of eating good food when hungry
I need to add that this is in regard to physical pleasure.
As for mental pleasures -- joy, satisfaction, gratitude, learning a skill or exercising a skill, social connection, etc. -- these arise when psychological needs are met. If you are regularly getting your psychological needs met and actively aware that they are getting met, then your life will be full of these kinds of pleasure, regardless of how long your life is.