Destiny is a 10 year journey. So since there is a possibility we may get to keep our character throughout (nothing confirmed) I was thinking...
What if our character aged over the years, like actually grew with us?
EDIT
This doesnt mean you'll be old and and useless, we're talking your character aging from 20 -> 30 years old.
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I love the concept maybe even scars from specific one time events. Or tattoos. Something to mark your experience. 20-30 isn't quite enough tho IMO. I'm sure we'll be able to play with our characters age in creation. 20-30 or 30-40? Or what about the exo? Rust? Deep gouges in their frames? Seems a little to far. Idk just throwing it out there.