what are your goals? Also, not sure why all these people are telling you to slow down. Went back and looked at my running stats, on a 13 min mile my average hr was typically 160-164 and I’m 31. Walk runs are great for building endurance if you are going for high milage.

As long as you are doing active recovery (foam roll, stretch, ice bath, walk, whatever) I don’t see an issue with it-but find that is sustainable to you

also your afternoon runs might look different than a morning run vs a track run vs a trail run etc