Depression, ADHD, Bipolar, etc are very much tied to genetics. Somewhere between 55-60% of depression is genetically "gifted". The other half are sociolaogical causes, for example, a traumatic event, bullying, whatever.
In 1960 we didn't have a ton of pyschologists and psychiatrists running around. We do now. My wife is a psychologst that treats youth related depression, ADHD, etc (whole littany of stuff). The broken home/non strong nuclear family thing simply isn't true. Adding more men to the mix ain't the issue. First, huge misunderstanding about mental illness. It likely plagued people back then as it did today. It just wasn't discussed and the person never got treatment. That means the report now will much higher and appear to show greater numbers of people afflicted with an unfortunate malady. In reality, that is not the case. The rise in depression/suicide rates, etc in youth is by and large a sociological issue. Could it be because your dad beat the crap out of you? Of course. Could it be because your parents sucked ass? Absolutely, but by and large there is a direct relationship between the triggering of an illness or the exacerbation of the illness with screen time--largely social media. During Covid that level skyrocketed and unfortunately for children, they may not recover. For example, my wife asks each kid and parent to show them their phones with the the most recent info on it for screen time a week. Pretty staggering.
While positive influence can help assuage some levels of angst in a child or teen, genetics says you need medicinal help. It is not an either or deal either. Combination of therapy and medicine has been proven to be the best hope