Could be a comb tail or half sun. Definitely not a plakat, the dorsal and anal are already too long for one plus it is a young fish and I bet the fins will grow even longer.
I would guess it is part crowntail and part viel, meaning you end up with a mix of both traits. I say this mainly because of the length of the dorsal and anal, where VT has the longest and thinnest of all fin types.
can be a crown as well
5 to 10 years
Combtail, most likely going to end up being a delta, it is not a halfsun.