As I measure out the oatmeal for a batch of "Soft Oatmeal Molasses Cookies," I find myself thinking about marriage.

My husband and I celebrated our 49th anniversary this month. In just a few weeks, we'll attend our granddaughter's wedding. As I scoop ingredients into a bowl, I find myself wondering what advice I'd give the young couple beginning their life together.

What makes a marriage last?

I add the molasses to the dry ingredients. Oatmeal is Frank's favorite cookie. Mine is molasses. They're two very different ingredients, but together they create something sweeter and richer than either could alone.

A marriage is a blend of preferences and personalities and a whole lot of compromise. Frank likes songs from the 50s; I like the 70s, so on road trips, we listen to the 60s. He asks me how to spell words; I ask him to interpret financial statements. He pretends to listen when I rattle off the names of the flowers in my garden; I pretend to listen when he talks about lawn fertilizers and weed killers.

I scoop the dough onto a baking sheet and slide it into the oven.

When I was my granddaughter's age, I thought a good marriage was mostly about finding the right person. Now, I realize it's more about becoming a good partner.

Over forty-nine years, here's what I've learned.

Don't overmix.

You don't have to become identical. I'm tennis; Frank's pickleball. I'm writing; he's woodworking. I wanted a new puppy; he wanted a new car. We give each other space and respect each other's desires.

Preheat the oven, and don't expect perfection.

Good things take time. Don't rush major decisions when emotions are running high, and don't give up during difficult times. These cookies I’m making won't emerge perfectly round and identical, neither will the people eating them. Partners annoy each other. They rearrange cupboards and leave dirty dishes in the sink.

But this isn't The Great British Bake Off. It's real life, gooey fingers, flour smudges, and all.

A little softness matters.

This recipe isn't for crisp cookies. It's for soft ones. Choosing kindness over criticism will help make a marriage last.

Don’t forget the coffee. 

The recipe suggests serving these cookies with coffee. Marriage needs companionship beyond the two people who said, "I do." Friends and shared community events add flavor to life, just as coffee complements cookies.

Be patient.

The cookies take longer to bake than I'd like, but eventually their warm aroma fills the kitchen. Patience is another essential ingredient for a good marriage. Frank and I started out with very little money. We worried over bills, survived our children’s teenage years, cared for aging parents, and weathered the "burnt bits" of life—events we could never have foreseen on our wedding day.

But time passed. Our hard work paid off. The babies grew up. Grandchildren arrived. The worries that once seemed overwhelming softened around the edges.

The timer dings, and I pull the cookies from the oven.

As I arrange them on a plate, I think about my granddaughter and her fiancé as they prepare to begin their own life together. Marriage isn't easy. It's made up of complicated ingredients: compromise, forgiveness, patience, humor, and love.

"Hey, honey," I call down the stairs. "Want some cookies?"

"I thought I smelled something good," Frank replies. "I'll be right there."

Forty-nine years later, I'm still glad I answered yes to him.

And if my granddaughter and her future husband are lucky, they'll discover what we've found: that a good marriage isn't about finding someone exactly like yourself. It's about blending your unique ingredients into something neither of you could create alone.

All these years later, I suppose that's our recipe: a little oatmeal, a little molasses, plenty of patience, and a willingness to keep mixing.