Do Super Heroes Ever Get Old?

an interesting question,

 and one that artist Swedish artist Andreas Englund gave some thought to,

when he started work on a series of oil paintings called the Ageing Superhero,

the paintings show the superhero looking back on his life and reflect on the modern day failings that effect us mere mortals, for a look at more paintings in the series have a look here, but it still does not answer the question, do superheroes age?