Continuous meaning you have the gas cooktop wired into a regular electrical circuit, right? Those will be as simple and durable as it gets. Battery powered ones are for off-the grid use and for places where you can't conveniently hook into an electrical system. Day-to-day operation is equally simple, but ....
Thread: Videos of Chloe (not as Stephanie) The 11-year-old Chloe Lang is another actress who plays the difficult role of Solla in LazyTown. She took over from Julianna Rose Mauriello that was growing out of the role as she is close to 23 years old today.
From this it can be concluded that Natsu is at least 14 years old. That is the only thing we can know for sure. But as to how old he really is, there is no definite answer. The Battle of Fairy Tail suggest that he might be older than 80 years old, but it was never mentioned explicitly that he is.