Just tested mine as I have a load thru seat.. 6 ft and 14 stone-ish. . Bit benchy and a firm back- wouldn't want to be in it hours.. but agree that a booster would fit well and a teen would probably happily sit there for a journey.

The advantage too of the load thru is a much better rear view when the upright is folded down as a posh armrest.  P400e HSE Portofino Blue and Ivory Seats.. it's like a yacht!!
Lexus traded in ..a total piece of crap
Boldly now acquired - a Lexus RX 450hL
BoldlyGone...Sep 15 MY16 RRS SDV6, HSE, Barolo Black, Espresso/Almond interior.. Best car ever & Drop dead gorgeous... sadly with fuel dilution headaches that became intolerable
Arrived 2014. Oct - Lemoned March 2015- RRS SDV6 HSE
Boldly Gone = Sold for 14k via Pistonheads - 2006 TDV6 SE Buck Blue/Almond int