Wakaba is one of several Team Japan figure skaters who will receive a TV Asahi "Big Sports Special Award":
https://twitter.com/oro1_/status/932863603635494913
They show her age as 17, which I assume is how old she will be when she actually receives the award...
I believe she's 17 now and will be 18 on January 1 2018 in Japan.
Actually, I don't really know how it's nowadays. But that's what caused my confusion some years ago. People being 1 year old when born, not having birthdays etc.
Wakaba herself probably doesn't use that but I don't know what that TV station thing would use.
I found some reference:
"The older form of counting is the ‘man’ system. In Japan one’s age is counted from the day you were supposed to be conceived – hence in Japan they say that a pregnancy is ’10 months long’, since in the west they usually start counting pregnancy from the first missed persiod.
In the older system in Japan the first year is not a full calendar year. So when you are born, you are called one year old, and then on the next Jan. 1st you are called a year older. For example, if a baby is born on Dec 1st, it is called one year old. One month later, on Jan 1st, the baby is now ‘2 years old’, or really, in your second year. But birthdays are still celebrated on the same calendar day – otherwise you’d have 127 million birthday celebrations on Jan 1st.
On some resume forms for example, you might still see the Chinese character for ‘man’ in the birthday form, indicating
that the system used is the man system. "
I'm not sure when exactly it was that I ran into this but I'd generally assume if age in official documents in Japan is 1 year above the actual age, this would be the reason.