I did watch the video and it touches on a lot of different points.
This is a 55+ man discussing the experiences of 55+ men who have found themselves single after a divorce. Rarely is he discussing the experience of the life long single male. The 55+ men of today are Boomers and and Gen X'ers who grew up in a different world than Millennials. I'm an older Millennial with a Millennial worldview. Few Boomers and Gen X'ers are life long singles, though this will change when more of the Millennials get into their 50s. However, the majority of older Millennials (1980s born ones) have gotten married and many have young families now and are starting them. With that said, there is more childlessness and more life long single males among Millennials than predecessor generations.
55+ men who grew up in a Western nation had a healthier sexual marketplace than the Millennials that came of age circa 2000 and later.
His own experiences and the men he talks to are men who grew up with the blue pill ideology of getting traditionally monogamously married. These are men who were born in the late 1940s - late 1960s and were really coming of age as Second Wave Feminism (1960s-1980s feminism) was starting to take hold. They grew up to believe in the example of sustainable marriages as their GI Generation parents (1910s-early 1920 births) and Silent Generation parents (late 1920s - 1945 births) had lower divorce rates. The GI Generation that raised most of the earlier Boomers stayed married (whether they were happy or not is another discussion) and the Silent Generation had a better track record in marriage than successor generations. Things started to change for the Silents, especially the later ones. The Silent Generation was the first generation to use the birth control pill (between 1960-1965, almost no Boomers were old enough to be on birth control) and they were the earliest no fault divorces of the 1970s USA. From 1970-1975, most Boomers were either in new marriages and not unhappy yet or too young to actually be married. In the 1970s, the Gen X kids of the first wave of no fault divorcee Silent Gen parents were called 'latchkey children'. In general, both Boomers and Gen X'ers grew up with a healthier notion of marriage from the sustainable marriages of their parents. Whese these Boomers and Gen X'ers reached adulthood in a changing sexual marketplace due to the Sexual Revolution/Second Wave Feminism, they soon learned that the model of adult romantic relationships they had growing up was far less realistic. While most of them could find girlfriends and even wives (the rise of incels didn't start until Millennials), they might not have been able to keep those marriages together "til death do you part". Boomers and early Gen X'ers experienced a good deal of divorce. A failed marriage has a good chance of shattering a blue pill ideology.
Men find youthful looking female bodies most attractive. This is what tends to give men erections whether they are in their 20s or 50+. Women's bodies become less exciting to look at as they age. Even an in-shape 40 year old woman doesn't have as nice of a body as a 22 year old college senior with a normal range BMI. For older men looking to date again, finding a woman who is attractive isn't going to be easy as he'll have to choose from women near his own age. That statement is more true for USA/Western men staying in their Western home country. Some men choose to try to solve this problem by going to Asia or Latin America where they think they have a better chance of getting a substantially younger woman. This is a smaller subset of older men as most older Western men end up staying in their Western country. I rarely talk about Western men going to Eastern Europe, Asia, or Latin America for mating purposes because I don't personally have experience with it.
Guys in their 50s/60s dating women near their own age have to deal with blended families. These older men typically had their own children in their own earlier in life marriages and then the women in their 50s/60s often have teens - early 30s children. Depending on the age of the children, it's a pain in the butt. A 50 year old woman might still have a 15 year old who is still living at home and an 18-24 year old who still might have some level of dependency on their divorcée mom and could even still be living at home. That's not a fun experience for a 50 or 55+ man to deal with. Blending households with adult children who are mostly independent is also not a fun experience for older couples. It's not fun for the older couple themselves and the adult children on both sides tend to not like it too much either.