From the examples you give, yes, I would be beginning to worry. I forget things very often (but no more than I always have - I refuse to clutter my mind with unnecessary things, so make lists). Do you have any siblings? Does your mum have any friends you could mention your concerns to? Talk to them, if so, and see what they think. Otherwise I would be seeking medical advice - in a general sort of way. Good luck.
P.S. Age is no real indicator, Mr. J2 will be 84 next week and is as sharp as ever and as forgetful as ever. I've known much younger people developing serious problems.