My bp went high when my husband died, I could hear the heart beats in my ears when I lay down, that was caused by stress, which raised my cortisol levels. I worked very hard on reducing stress, just sitting and looking at trees, walking by a river and in nature. Calming music, particularly by Snatam Kaur.
My diet was always good but I am aware of the potential of increasing bp with age, so I cycle or hill walk every other day, while staying active, using the stairs etc. I stick to set meal times, don`t have to look at the clock. Main meal between 11.30 and 12 and last small meal between 3.30 and 4. This sets my circadian rhythmns as does morning light, helping me get to that sought-after good nights sleep which is so healing
Gut microbiome has a huge role but is a big topic that you can research, mine is very healthy. My bp is 123/60 at age 76 and I am not thin