Should I get a double stroller?

Debating if it’s worth it or not, I have a three year old (3 yr, 3 mo) and a 6 week old. We take lots of walks around the neighborhood and parks and my three year old loves to walk but she does get tired if we walk long distances or has more trouble behaving at the end (because she’s tired) and normally we put her in the stroller. But she is getting older and prefers to walk most of the time so with our new little one I’m just debating if it’ll be worth buying a double stroller. Anyone have had similar ages and have an opinion for me?! Thanks 💜