Quite a nice premise, MC's isn't in a complete bottom of society and doesn't suck out energy.
Reminds me quite a lot about MC's of previous generations.
Milf stories were up my alley (still are i guess, but it's not about the age gap anymore
) but the age gap of 16 years is too big, author will not risk shipping them.
I think there will be some dramatics and she will finally meet her long lost love(or someone else) while he will find a girl his age.
Age gap mangas usually have a limit in 10 years, if it is more than 10 they try to make MILFS as tutors and guides who eventually take the "correct" path to let them go and give them wings. Usually they break up quite amicably and stay as friends.
And honestly age gap of 16 years is too damn high, she needs to get pregnant in 5-6 years and he isn't ready nor mature enough to give her what she wants or needs. Also their relationship dynamics will be quite unfair (she gets a massive control over him, it's quite easy to take control of a young naive guy especially if she sleeps with him, i would even say some young guys are way worse than women when losing virginity to someone with more experience).