At 25 years old JB would have been a fully developed adult male. The above suggests he was under developed?
No I read into this that Jeremy felt remote from his parents from the earliest stages and felt awkward in front of them,turning his angst inward for many years,only for it to be released in an inexplicable frenzy of revenge one August Wednesday morning.The mystery is why he changed behaviour,when he wasn't making a bad attempt at farming,just he wasn't cut out for it and longed for something else. June offered to buy Sheila an antique shop in proximity to the Farm,and what a pity she didn't make a similar offer to Jeremy of managing a wine bar in London's West End.