characters 30+ find love

Naohito, single and pushing 40, is forced to attend a mixer where he meets Tohru, who is friendly, young, and speaks his mind - sometimes a little too much for Naohito, whose obsession with maintaining a perfect public image has cost him all but one relationship. When Tohru suggests being friends, Naohito sidesteps it, assuming they'll never meet again. But Tohru turns out to be an employee of an important client, so when his apartment burns down and he begs for a place to stay, Naohito agrees.

A young man feels a bond with his abusive mother's former lover, a member of the yakuza and the only person to ever show him kindness. (Multiple stories - this one is the first 3 chapters). The yakuza member is almost certainly 30+.

The third story: In the aftermath of a major error, a boss and subordinate find common ground in their shared loneliness. (I can't recall that ages are stated, but I'm sure the boss is 30+.)

A man transfers to a struggling company branch run by a manager he admires and once confessed to, hopeful that he'll win him over. But the manager is cold and violent toward him once he arrives, despite keeping a photograph of their former team on his desk. In the three months he's there, the man realizes his manager is struggling with pain from a previous relationship and may not dislike him after all.

Romance blooms amid the chaos of the publishing industry. Hilarious if you work in publishing but head's up for dubcon (main couple) and noncon (Tori; I skip his chapters).

At least two of the relationships have one 30+ partner: Kisa/Yukina and Yokozawa/Kirishima. They're also the best relationships in the series.

Drinking friends become something more in this spin-off to Doushitemo Furetakunai. You don't really need to know the original to understand this. In the present timeline, Deguchi is 31.

A year out from his divorce, Uematsu, a 40-something overworked businessman, frequents a gyudon restaurant and is befriended by the young waiter

A year out from a failed relationship, a lonely tailor is mistaken as someone intending to commit suicide and stopped on the platform by a high school student. That encounter changes his perspective, and he grows closer with his boss, whom he ends up falling in love with. They are almost certainly both 30+.

A chemistry teacher moves into the apartment next to a former student who is still in love with him. Sweet domestic fluff!

After his older brother died, Shima Sougo, a 34yo architectural professor, was left with a mansion and a servant. Guess what happens.