Sebastian L. Shaw played the original force-ghost of the redeemed Anakin Skywalker, in the final scene of Return of the Jedi.
He MUST and NEEDS to be reinstated as such, and permanently.
When Obi-Wan Kenobi became a force-ghost, he didn't miraculously rejuvenate. Neither did Yoda. Joining the force doesn't bestow youth! 
The Hayden Christensen force-ghost is a usurpation of Sebastian's legitimate force-ghost. Please bring back and reinstate Sebastian Shaw's force-ghost as he was in the 1983 release.
Seeing Hayden Christensen as a force-ghost MAKES NO SENSE. It's out of place. It looks wrong. It doesn't take a lot of brain power to see how amiss it looks. This is an opinion that MANY fans, including those in the actual production team, have felt since the original Anakin force-ghost was abruptly, unjustifiably and inexplicably swapped, from a 45 year old to a 22 year old. (Even if you didn't say it... but you thought it. Honestly now.)
Please, FINALLY do the right thing and return Sebastian Shaw as the rightful and logical force-ghost. Also this is an iconic role that, although brief, was summarily and unfairly stripped from Sebastian Shaw's repertoire of noted roles, that needs to be duly returned to him.