Re-reading, and it gets to me that he is over 40 mentally (58, really), and feels the need to pro-tec.
I'm not... old? But I'm over 40, and while boobs are important, so is interacting with an equal; nothing can be better than dealing with an equal after dealing with a teenage girl...
I don't think mental age should be added like that.
But again, not only am I neurodivergent but I can't really have any experience with rejuvenation and the like so it is only my opinion.
Sure, he had 40 years of life experience, but it was not
equal life experience. In his past life he went through the easily-forgotten development, to the childhood education at an age that
can be remembered, through the mental development of adolescence then to adulthood when the brain is fully-formed and all he learns is from life experience.
And then... he was put back on the, at least, childhood education age... with a
childhood education-shaped brain.
As much as he had the life experience of someone in his fourties, his brain and body
are the ones of a teenager at this point in time. As much as he
knows how he should think and act, it does not mean his brain
will behave like so.
In other words,
To me he is not "40 + 18 = 58 years old", or even "40 years old in an 18 years old's body", he is a 18 years old with life knowledge of a 40 years old but nothing else.
And so, while he may enjoy talking with an adult woman more, that is not what makes him
sexually interested in them more than someone closer to his physical age.
He is just a natural MILF enjoyer, but with the brains to mach them.