Is time changing or are people changing in time?

[snow15145]

No: HPFGUIDX 111587

Do you think that it could be possible to change your appearance 
before you go back in time? If say Tonks were to go back in time, I 
would think that she could do so without recognizing herself if she 
just changed her appearance before she went back. 

I guess the reason I thought of this is because of dear old Albus and 
his crazy watch along with the dreaded time-turner situations: 
How could Dumbledore have worked with Flamel in alchemy when Flamel 
is significantly older?
How did Dumbledore eat a vomit flavored Bernie Bott Bean in his youth 
when the company was established well after Dumbledore's considered 
youth?

Could Dumbledore time travel by altering his appearance so that no 
one, including his former self, would recognize him? Is it possible 
that Albus is like Tonks, a metamorphagus? If Albus is a 
metamorphagus, is he really as old as he appears? How would you know 
how old a metamorphagus is, really, unless you knew when exactly they 
were born? 

And now the watch! Could Dumbledore be checking his watch to see 
where else he is at another time in space?

Snow