As politely as I can OP - get a grip, and keep your feelings on this to yourself.
Your daughters tattoos are a part of who she is, if you express the opinion that they are horrible, ruining her, whatever... you are saying those things about an intrinsic part of HER.
YANBU to feel however you feel, those are your emotions - YABU if you tell her or let her know.
For the rest of you..
'They'll look awful when you're older'... So what, the rest of me won't be looking too hot at 70/80/whatever, should I seriously base every decision I make now on what others may think of me in 30/40/50 years time?
'They make you look common/cheap/chavvy/unnattractive' - your opinion on my appearance is your problem, not mine. I don't plan how I look to please or attract others - but thankyou for revealing what a shallow and judgemental person you are.
'You'll regret it when you're older ' - I think when I am older I will be grateful I lived a life free to make my own choices and had the health to live to BE old.
I am really glad i didn't listen to the latter in particular when I was 19 and getting my first tattoos. Turns out, I won't live to be old anyway! What a shame if I'd tippy toed about doing nothing that others might not like, or might look less than beautiful in my 80's, never daring to make a bold decision 'just in case'... and then found out my lifespan is likely to be 20+ years shorter than average!