Welcome @Kieranmack. We suggest a minimum age of 16 for our group rides, with your parents permission. If you’re under 16 though you’re still welcome but you should have an adult with you on the ride. And of course everyone is expected to ride within their own abilities and be responsible for their own safety.
We do ride some beginner friendly trails but most of our rides would be considered intermediate/technical. If you’d like to join us on a beginner friendly trail, watch for our rides at Shubie Park, MacDonald Sports Park or Nine Mile River.
Also check out the learn to ride clinics that @TrailFlow is putting on. These clinics are a great way to build your skills and confidence on a bike and also meet some like minded riders.
Giant Halifax also has a series of mountain bike rides just for beginners. Not sure if they have an age limit or not, but worth looking into.
Hope this helps, see you on the trails.