I feel a bit odd about ages gaps. They don't bother me as a rule. Some people genuinely meet someone and fall in love that happen to have an age gap.
However, I know several people (men and women) that only date people much younger. And yes, its weird.
Op your experience with the friemds older man wi colour your view. Just like my view is coloured by the people I know.
Ime, when people exclusively, date people much younger, the relationships always have an unhealthy dynamic. The older peolple (that I know) than only date younger people tend to be quite controlling and act like their parents. Constantly watching what they wre doing, telling them exactly what they must do, how to behave. Not always acting like their mother doing their washing etc. But definitely act like they are trying to shape the man, into who they want him to be.
The older men tend to spout the 'i am only trying to protect and look after you' line. The older women tend to spout the 'this is how a real man should act'.
Personally, I have never seen a relationship where the older person only dates much younger people, be a happy healthy long term one.
People who only date much older people are looking for something else. Not just a relationship with someone they love and again can have unhealthy attitudes.
I wouldn't rule out a age gap relationship for myself, unless that person I ly dated younger people. If I met someone older or younger and felt a genuine connection, their age wouldn't put me off.
When people only have age gap relationships, i cant help wonder why they have never had any sort if connection with some close to their own age. Or do they discount people just on age. Which is odd as they will also say 'age is just a number'. If you intl date much older or younger people, clearly age isn't just a number.