Keep things interesting.
They’ve been together a long time. That means that they are probably a little bit set in their ways and a little bit bored because of it! Not to mention that they tell the same stories again and again. Well, get them out and doing something different! Book them a tasting event, a cooking class, a tour of a nearby walking district or distillery, anything that will have them both learning and experiencing something new so that they will have more to talk about with you and other relatives.
Treat them to something special.
Maybe they really need a new set of pots. To any other couple, this would be a horrible idea for Valentine’s Day, but older couples are over the useless “stuff” and probably aren’t looking to steam up their boudoirs. So, give them something they truly need and make it nice. They’ve lived long enough to know the difference. Replace something that needs replacing or supply something new that they need but don’t even know about yet. Things that make their life easier together, more comfortable, more connected to their families near and far...those are the things that they’ll be grateful for on Valentine’s Day. Of course, writing them a letter about your favorite memories and including photos is an easy way to win them over without spending much at all, as well.