My cats are both 15 months old and have been freely exploring the back garden for about 3 months. Our garden is closed in so they’re only able to stay in there (they’re too lazy to think about jumping walls/fences). We keep the back door open but if they hear any slight movement in the house, they dart back inside. Presumably because the think there may be food available. Is it mean of me to keep the door closed while they’re outside? I want them to be confident in exploring without being spooked by every noise. I’m also considering letting them out the front door too. We live in a small courtyard where there’s not much traffic other than from people who live here. I want to encourage them to go further than the back garden but with our garden being quite closed off, they’ve not bothered to venture any further. They’re my little babies and OH is very protective over them but I don’t want them to be “inside” cats, mostly because the constant litter changing is the worst. He seems to think they’re still too little but they’re over a year old now and they love being in the garden so why not give them a bit more freedom and independence? Is 15 months still too young for them to be left outside/let out into the big wide world?