Realistically how long can one expect to keep using a retina Macbook pro? I've had my mid 2015 since.. Mid 2015 and now I'm getting paranoid it'll up and explod

Realistically how long can one expect to keep using a retina Macbook pro? I've had my mid 2015 since.. Mid 2015 and now I'm getting paranoid it'll up and explode on me out of the blue I have a new OWC SSD upgrade so that should be alright.. Trying to keep it running cool without heavy software but the battery is at like 500 charge cycles and 70% capacity man it feels so scary getting old