To care for your baseball glove and extend its lifespan, start by cleaning it once a year with a wet rag to remove dirt, then conditioning the leather with a small amount of conditioner (preferably over oil, as it keeps the glove lighter and maintains its color).
After conditioning, store the glove in a dry, temperature-controlled environment away from sunlight and humidity. During the season, avoid spitting in the pocket, tighten loose laces, and keep the glove out of direct sunlight, preferably face-down in the dugout.
For older gloves, tightening or re-lacing can help extend their life. Tightening is simple, involving untying and retying the laces, while re-lacing requires more time and patience, using a glove needle and new lace. After re-lacing, play catch to help reshape the glove.