Canon is determined by what the canon sources show, not what a dude who made it says. Besides, he only said she was likely to be ~50 as of K2, so even if you follow the rule that what a person says overrules what is shown, her age is still simply unknown, at best.
"There is something going on in time and space, and beyond time and space, which, whether we like it or not, spells duty." -Winston Churchill
"For of all sad words of tongue or pen, The saddest are these: 'It might have been!'" -John Whittier
"Apathy is death." -Kreia