Whaf if you wanted to read an age gap story
But God said:
Bam, pedophilia
Why are they always 16 or 17, just make them 18
Well,you're more like to find an appropriately short lass whose ass isn't too heavy for your shoulders when they're younger.
A five year old,though,might be good for the long distance attack bonus but the much less mass means a lack of damage at shorter range.
Around 12 is the best balance,better still if you find one who looks as tall as a 18 year old but still weighs the same,you get very good vertical range as well as enchaned obstacle counters.
Some players,though,find that an 18 year old with the shortstack density trait can do amazing damage despite the shorter throw range.
All depends on your playstyle.