All I hear is a weak man fighting his immaturity.
Thanks to my years of expose, I no longer buy love stories. Just like your aunt, most of the long lasting marriages I have seen had the women suffering in silence.
To answer your question on why these older men don’t go for women of their age. That's because younger women are vulnerable and gullible to believe their lies and deceit.
We have been indoctrinated to believe older means wiser. So even a 35 year old dating a 60 year old will believe his words are genuine. Only a few read between the lines.