I have a true Fiji dwarf that came from Hawaii and a Fiji hybrid that came from Puerto Rico (have both since they were just a nut)
The Fiji hybrid is almost 4-years-old, but it has been fruiting since last year. It's quite a specimen with 4 feet of visible trunk, super long fronds and a very thick trunk base. The true Fiji is almost 3-years-old and just started trunking.
Here is the base of the trunk for the hybrid:
My daughter hugging it:
The one in the front is the true Fiji Dwarf and the one in the back is the hybrid: