He doesn’t last long.

So my husband use to last a decent amount of time while having sex. When we first got together 6 years ago, he would last 10-15 mins. Now that he’s older he hasn’t been lasting as long. Now days he last 1-3 mins. That’s it. We’ve tired everything to make him last longer. Foreplay, getting him off before we have sex, stopping/slowing down in the middle of sex, everything. Even if he gets off and then we try to go again right after, he still gets off very fast. Or even if we take a 5-10 min break he will still get off fast. Could something be wrong? Has anyone else had this happen? Should he go to the doctor?