There’s no age where it’s too late to become kinder. That kind of change doesn’t expire.

Character does not harden on a schedule, whatever the people around you imply. Kindness in particular is not a trait you either received or missed; it is a set of things you do, and the list of them is available at any age, in the same way it was available last year. Nothing about getting older closes that option.

Pick one specific version of it this week: the message you have been meaning to send, the apology that is overdue, the person nobody sits with. Keep it small enough to actually do, then do it again next week.