Three years after Trunks goes back to his time
period and kills #17 and #18, he finally takes
on Cell. Naturally, Cell is killed pretty
quickly since he didn't attain his Perfect form,
and Trunks is much more powerful at this point.
The only appearance of 23 year old Trunks is in
the very last episode that Future Trunks is in.
This is the last time we get a chance to see Future
Trunks in DBZ.
That's it for
Future Trunks! Read about 8 year old Chibi