Harold can fuck right off then because that's not his business. The other two, could potentially be an issue, however, but in my experience, most apartments like that are not filled with retirees, but working class individuals and to an extent working class families.
>>Harold can fuck right off then because that's not his business.
Don't come to Japan then. [1][2] Like it or not, some cultures (including the older generation of Americans) hold certain social mores that include expectations of public appearance and decorum.
[1]https://www.japantimes.co.jp/news/2018/12/19/national/stigma...
[2]https://observers.france24.com/en/20170504-japanese-authorit...
The real problem with gentrification is the unearned increase in property values that accrue to owners and not renters. This could be solved with Georgist land value taxes [1].