Would you tell her?

I think make no comment at all. I would be very upset if someone said the same to me...not that I wear minis skirts. She is your friend. Ignore any comments you hear.
She may decide herself she doesnt suit them.

I would comment when she dresses appropriately and really compliment her, stay quiet when she looks grim!

Not many women in their seventies will look good in mini skirts but if she feels happy wearing them then that's all that matters.

That is YOUR opinion..keep it to yourself .Its none of your business what she wears ,if she’s happy and confident in her choice of clothes don’t knock her confidence .
I,m 72 I wear dresses just above my knees,leather trousers,over the knee boots…my daughters friends call me her wee glam mammy .I,m not glam at all but I wear what I want and nobody else’s opinion will stop me

I think the suggestion that you compliment her when she looks good is a helpful one. It's just embarrassing when someone looks like mutton dressed as lamb or as a charming colleague said 'carrion dressed as mutton'!

I agree with the above posts. Ignore any comments. It’s up to her how she dresses and 70 isn’t that old.

If she is wearing what makes her happy, then say nothing. Your opinion is just that- an opinion.

I am a firm believer in women being able to wear whatever floats their boat, we are judged so harshly by so many that I just think you have to plough your own furrow and to hell with what anyone thinks. Certainly as we get older we should be able to do as we please when it comes to sartorial choices.

I think the point here is, are you embarrassed to be out with her when she is dressed in a way that draws attention, if not, then just go with the flow and enjoy her company.
If you are embarrassed then you must decide whether to go out with her at all.
Just don’t upset her by saying anything.

Sago

I would comment when she dresses appropriately and really compliment her, stay quiet when she looks grim!

This is wise.

Unsolicited advice is very rarely welcome, particularly when it includes criticism.

Say nothing! even as a friend, you cannot be expected to become a member of the fashion police it oversteps the mark and could damage your relationship.

As others have said, compliment her when she looks good. Mini skirts look ridiculous on older people as does long hair generally (not always). Women think these things make them look younger when actually the reverse is true. And we actually do judge people on their appearance generally even if we say we don’t.

Aveline

I think the suggestion that you compliment her when she looks good is a helpful one. It's just embarrassing when someone looks like mutton dressed as lamb or as a charming colleague said 'carrion dressed as mutton'!

Haha😂love that one Aveline

I would go with the compliments when she dresses well and ignore the silly miniskirts.
It must be embarrassing to be seen out with her OP.😬

Depends, if she looked like hooker, yes I would say something, especially if I was out shopping with her.
I have a friend who wears really short skirts & clumpy shoes. She looks ridiculous, but I don’t go out with her, so doesn’t really affect me.
Down to her daughters to tell her.

She's happy leave her.
I wear shorts in the summer and I have a big scar from my knee replacement, I'm happy in them but I'm sure I will know when to stop wearing them. She will know when to call it a day.

There is an article in the DT advising you how to wear mini skirts when you are older. Perhaps she has been reading it.
But do not say a word if you wish to remain friends.

You sound very judgemental saying her legs are 'not nice' what is that supposed to mean?
She would be upset if you tell her? Then don't tell her!
I see so many young women walking around who look good awful with their fish lips and pantomime dame eyebrows, but I wouldn't say anything to them- they probably think they look great and so should your friend.
Ignore what other people say too- they sound very bitchy to me.
She is 70 years old and has earned the right to wear whatever she wants if she feels comfortable in her clothes.

Should you tell her? - no.

Dressing is about feeling good - and she feels good. It matters not what others think.

It's nobody's business but hers. I have a friend who is 75 and wears shortish skirts. She also wears very low cut tops with push up bras so her boobs are always out. I would be embarrassed but she isn't. It's up to her.

I'm in agreement with Sago and Doodledog's advice.

This reminds me of the advice given when our children were young - reward good behaviour and ignore bad.

The advice here then to compliment your friend when she looks nice (and, dare I say it, age appropriate!) and ignore the mini skirt look seems wise.

If she ever asked your opinion though when she’s wearing the short skirt, well if you think you could phrase it tactfully, then perhaps gently say something.

Sago

I would comment when she dresses appropriately and really compliment her, stay quiet when she looks grim!

This is a good tactic.
As a poster upthread asked, yes it can be a bit embarrassing. She doesn’t have the personality to carry it off and so spends a lot of the time wriggling and pulling at her clothes. It’s not just mini skirts.
To other posters, I do think we should be able to wear what we want but when a friend is being ridiculed within earshot my reaction is to defend them, some people have loud voices and don’t care who hears.

The friend I mentioned loves the attention, good or bad. If anyone says anything bad, she puts it down to jealousy. She really doesn't care.

Wear what you like and pay the price of others laughing at you if you look ridiculous. Peopleare judgemental however much we wish they weren't. It's just being human.