It is the transition from a collegial atmosphere to a professionally managed corporation that is difficult.* Related, check out the 3 generation rule of family run companies.
If you want something even more interesting, in Japan, most adoptions are of adult men.
Adult Adoption in Japan
*I have been through this. I was employee #5 at a company that we grew to nearly 40 people and were on track to grow to more than 120 in the next two years when we were bought.
