Doesn't fill the mental needs, but you just get better at suppressing them over the years.
Would be nice to meet someone who shared my interests and take on life, but the only ones I've found don't find me particularly attractive or already got snatched up. And what's the point of starting a relationship with someone who doesn't share your interests and take on life? Fear of dying alone? That doesn't seem to me to be a good enough reason.
Eh, well, dying alone doesn't seem too bad in an era where you can literally pursue any fascinating hobby you want with relatively low startup costs (FPV drones, dirt bikes, rock climbing, backpacking around the world, you name it).