I’m 49, weigh 360, and feel fine.
Feeling fine is good but if you aren't already doing so, I would get regular physicals and pay attention to the results.
Many times, a person feels fine but internal organs are operating under stress and constantly complaining about being overworked. These internal complaints manifest themselves in the form of elevated and even abnormal levels on a variety of blood tests. Unchecked, one or more organs will suddenly go into failure and that is when you suddenly stop feeling fine but it's usually to late to fully recover at that point.
It's while you feel fine that you can make necessary changes to prevent a future breakdown.