When a heart gets damage is that for life?
I dont know about for life but some of the studies are showing structural changes to the heart, like the recent German studies:
Their average age was 49 and two-thirds of the patients had recovered at home. More than two months later, infected patients were more likely to have troubling cardiac signs than people in the control group: 78 patients showed structural changes to their hearts, 76 had evidence of a biomarker signaling cardiac injury typically found after a heart attack, and 60 had signs of inflammation.
https://www.statnews.com/2020/07/27/covid19-concerns-about-lasting-heart-damage/
Here is an editorial discussing the research on heart issues:
https://jamanetwork.com/journals/jamacardiology/fullarticle/2768915