> desperation as he quit society and normal life between the ages of 18 and 25
If your child face-plants out the gate at age 18, then it indicates gross failure of parenting and the school system.
[1] over 90% of Hikikomori are men http://ijfs.padovauniversitypress.it/system/files/papers/IJF...
[2] Findings in this study suggest that 76.4% of the cases are male and 22.9% are females. https://www.proquest.com/openview/d2fb2f85ee1b7f913be30ed142...
[3] it is estimated that there are 700,000 hikikomori (1.8% of the population between 15-39) with the male:female ratio of 7:3(66.1%:33.9%). https://ameblo.jp/lastpray/entry-10819921709.html