I knew some people with this age gap.
Ofcourse - you couldnt decide, where your love flows and we are not the ones who could declare what is good or bad.
But that high age gap leads to some problems you have to think about.
Being in mid 20s means your active life, you earn money, have a family and do some things you enjoy is before you. Being mid 60s means you are near to the point active life is more behind you, then you want. For sure, younger persons let you feel young again. But at some point, you couldnt neglect your functional disorders. And this gap could also mean, most of the time, you will be the caregiver for the older, till his end. After that you have a very long time, you are alone - and this can be very hurting - trust me: that is a real struggle for the younger part, who i know.
40 years is very much difference also in the experiences you made. He was born in a very diffrent time and some struggles he wouldnt understand. For myself i feel the generation gap much earlier. Sometimes less than 10 years could do a very big diffrence. Only imagine if someone is now born and didnt experience the last 4 pandemic years.
Sorry i do the wrong thing to say too much. But I had a very bad experience in my life with this age gap and iam happy, that i could grow with my wife at the same level.