Someone who is super attractive and over 35 but still single isn’t an automatic red flag.
Since men are usually expected to carry the financial role in a relationship, he has the burden of getting himself financially sound.
The reality is, there are several men who choose to bypass getting into serious relationships until they have established themselves financially.
He works really hard to get to a place financially where he can own his own house and car, afford vacations, and most importantly, afford to provide for a woman and future offspring.
Hopefully, during that period of time that you weren’t dating, you were growing as a person.
You improved your skills in areas that mattered to you, built stronger relationships with friends and family, traveled, and got in better physical and mental shape.
What really matters is that you took that time to do constructive things with your life.
As long as you are someone who is similarly introverted, with no friends or a very few, and used to staying home for leisure rather than going out to socialize, it wouldn’t be a stretch to date someone who has no friends, as you would have similar lifestyles, which facilitates compatibility.
This is assuming that this is someone who doesn’t have any emotional trauma that has kept them from developing friendships with people.
Having no friends is usually a sign that you are either dealing with someone who prefers being alone and not going out to socialize or someone whose personality and character are so questionable they turn people off.
There is a difference between a harmless introvert and a sociopath.