It's absolutely nothing to worry about. I'm sure you'll have a few signs of age when you're in your mid eighties !
The cracks in the mortar are completely correct as already mentioned, you want the cracks with the mortar beds and not through the bricks themselves, the mortar mix /pointing wants to be weaker than the bricks. Then it's easy to repoint with weak mix.
All it is is a little settlement, not subsidence. Rest easy.
But never ever sit in the lounge near the bay windows !!!!!
Wow, so you did ...... I did not realise things got modded based on some of the comments/arguments I read on other posts....perhaps you got the wrong advice/joke ratio....
A little settlement is normal a few cracks and nothing major occurring, subsidence on the other hand can cause walls to go out of plumb, floors to drop. Major moment not fine cracks.
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