Can a biracial childs skin tone get darker with age? If so, for how long?

It really depends on how much sun light they are exposed to, and their age plays allot to do with it. I mean like my mom is fair and my dad is relatively darker, than me. but when I was like right up until I was 10 I was white, and by thirteen I got noticibly darker my 13 and I get seasonablly lighter in the winter and dark with the sun, it is kind of neat because I have told the people at motor vehicles that I lost my license and get a new photo in the summer and do the same by getting another in the witer and you can't tell if I'm the same person. really