My only concerns with this relationship are the same ones I have with every relationship that has such a staggering age difference: longevity. Right now they're in love, having a baby and really excited about their future; they have their common interests, dreams and goals, but how long is that going to last? Pearl is seventy-two years old, he's twenty-seven -- there are two generational differences with values, traditions, ways of child raising, ideals, dreams and et cetera, that haven't even come up yet to be dealt with.
Not to mention, what about when this child grows older? By the time he/she graduates high school, Pearl will either be 90 or dead. (I have no clue about her medical history, but for Pete's sake, the woman is no spring chicken.) Technically she's not being forced to give up this child, unlike her daughter, but is almost imposing a deadline of how much time they'll have together. (I know, I know, anyone can die at any time, yada yada.)
I haven't yet seen a relationship with a huge age difference, like this one, survive past five years unless it was based on waiting for the old guy to drop dead so the bimbo can inherit gobs of money just for shaking her ass a few times a week and helping along the heart attack that eventually killed him. All the power to them and it's great that they're happy, but can't say I think they're having a child is the greatest idea.