Not sure I get the aversion to aging. I don't think Frakes is too old at all. Think about all the older captains and admirals we've seen on Trek before. I would love to see him in the captain's chair.
Sure, Data presents a problem because he's not meant to age. But Riker is meant to grow old.
I think they could work around the Data aging thing. Maybe he just decided to alter his appearance for whatever reason. He did try having a beard.
And he played with adding grey to his hair, also, didn't he?
"Why, yes, Captain Riker, I did age my face. I find it uncomfortable looking the same age, while all my friends faces are so wrinkly they look like a Pit Bull's butt"
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?