We met a lovely young couple on holiday, both of them were covered in tattoos. The young woman had her hair shaved underneath and her head was tattooed. She was telling me, I didn't ask, that she was an optician and wore her hair down for work.
I wonder why she felt the need to inform you what she did without being asked.
And I wonder if she would have been so quick to tell you her job if she worked on the tills in Poundland? 
I agree with the poster who said there seems to be a trend amongst middle aged people (usually women, and not middle or upper class ones!) to have tattoos, often when they have never had any before. They are often done badly, and are the names of their kids or their current boyfriend. cringe
I have lost count of the amount of chubby middle aged women I have seen with tacky tats on their upper arm (with short sleeves of course, so everyone can see the tats,) or on their breast (VOM!) or on the back of their neck, or their back!
Ugly as eff.
Almost everyone I know under 35 has a tattoo. Many years ago, 80's/90's, you looked a bit edgy and cool if you had a tattoo, now you just look like a sheep, and you look more cool and edgy if you haven't got one. Some people think they're so youneeek by having tats, but everyone has them, so they're really not!
I also think you are closing a lot of doors for yourself if you have lots have tattoos that are very visible. Like it or not, people WILL judge. I have seen some younger people whose tattoos look OK, and other younger people whose tattoos look utterly fucking shit.
I do think is rude to say anything to anyone though, and would never say it in person. I would judge (some people) on their tats, silently, but would not say anything.