My mom (43) is dating a much younger guy (27). Does the age gap make them incompatible? Should I tell my concerns to my mom to prevent heartbreak?

My mom's been dating a guy way younger than her (he's 27, she's 43). I've always been alarmed by the age gap, but when they started dating I assumed it would be nothing more than a fun fling. However, as they've been dating longer and longer I've slowly recognized that may not be the case. A few nights ago I overheard my mom telling her boyfriend her doctor apparently said even though she's a little older there's a very real chance she could get pregnant again. They were both excited. This brought all my concerns to a new level. Such an age gap is almost always an indication of being in very different places in life. I also think she might be thinking with her crotch more than her head. He is a physically attractive guy and (even though she tries to hide it from me/thinks I can't hear) I know she very much enjoys the sexual part of their relationship. Moreover, I know she's always wanted another kid (the only reason why she didn't have another is my dad didn't want one). I think she wants to get pregnant now (even though they aren't married) because she thinks her chances are running out. I'm worried she might with this guy in large part because she thinks a younger man might increase her chances for pregnancy.
I'm not saying there's no compatibility between them, but I think the age gap is going to make things too difficult to work. I think my mom's turning a blind eye to it. A big part of me feels that if I care for my mom I should try to point out the warning signs to her before she makes a big mistake.
Nonetheless, I do recognize the reasons why I think they're incompatible may more so link to the fact I think the age gap is crazy weird over overwhelming incompatibility. However, I'm not willing to write off those suspicions as completely empty either. How can I tell if I'm right in thinking they could be wrong for each other/have too big of an age gap? Should I tell my mom about the problems I see in her relationship to try to prevent future heartbreak?
My mom (43) is dating a much younger guy (27). Does the age gap make them incompatible? Should I tell my concerns to my mom to prevent heartbreak?
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