There are all kinds of ways in which older people subtly apologize for being old: feeling ashamed of their appearance without clothes, spending thousands of dollars getting cosmetic procedures, dying their hair, feeling out of place around younger people, etc., etc. In other words, they agree with the world at large that being old is something negative that needs to be covered up, concealed, excused.
Some people, though, are able to age without feeling like it is something they have to apologize for. I saw a great documentary the other day on Netflix, titled "Iris," about a 90+-year-old fashion icon named Iris Apfel. Everyone should watch it. Iris is 91 or 92 and still having the time of her life.
I enjoy hanging out with adults of any age - young college students to the old old. I'm sure there are people who harbor negative thoughts about me because I am well into my seventh decade, but as they say, "What you think of me is none of my business."
Believe me, if anyone knew how great this stage of life is, they would be lining up for it.