Does an age gap relationship make sense?

I think for me I'd want it kept within 10 years. Much more than that in either direction and there will be differences arising from age even if you're not seeing them right away. There's a lot of experience to be had in a decade's worth of life that I think at times would make it hard to continually relate to someone that much younger or older. But there are of course cases and people where this wouldn't even be apparent. We're a fickle species.