Can you elaborate? Do you mean getting kids? I just got out of a relationship that felt too close for me...

As a widower who just sent his kid off to the grandparents to visit for a few days, and is now missing his person, his kid, who relies on him and feeling the effects of missing purpose...

Sure, it could be kids, a partner, a spouse, or a friend or family. But it could also be the rest of the team on the weekly bowling league, the puppies at the shelter who need playtime each week with a volunteer human, the community one serves as a volunteer firefighter, the homeless shelter where one helps serve the weekly dinner, the neighbor who needs help with yard upkeep, or any other parts of the village where one lives that relies on you, and makes you feel included, involved, and fulfilled inside by having that purpose.

I think they mean you should commit yourself to something that you have to show up for regularly, because someone you care about is counting on you.

Not kids. Maybe start with a gym or workout buddy. Then work your way up to projects or volunteer work, with people you can't blow off.