My first grannyisct attack.

Changing the subject slightly - my first grannyist attack was when I was about 65. Walking along a pavement in Southend and some little boys overtook me on bikes. I nearly lost my balance.
I shouted after them "You should have a bell and warn when you overtake!"
One of them replied "Silly old bat!" I was quite offended.

No, of course not. Sure we can all agree on that.

Was agreeing with Polly.

When I had 2 very small children in the pram I remonstrated with a young cyclist who nearly ran into us, on the pavement. He responded by shouting "F* off, Granny". I was about 30. Anyone over teenage, I suppose, seems old to children.

I must admit I would be shocked if a 49 year old woman did not have all her own teeth and, barring health issues, be capable of a long bike ride and appreciating flattering male interest..
Many of us have daughters in their 40's, mine is running a half marathon in the Autumn and were she not to have a extremely attractive and loving DH would I hope turn a few heads!
So the issue is not how good OP looks/feels for 49' but that she finds that surprising or mutually exclusive with being a (young) grandmother.

The remark made by the OP's friend was said as a joke surely. I was a Gran when I was 44 but that didn't make me an old lady before my time. I am 69 now and still enjoy a flirt.

Yes agree with you it was probably a joke or lighthearted remark, on the basis of which the OP has constructed her very long stealth boast about things none of which are very surprising or remarkable in themselves.

I'm guessing your 'friend' hadn't been flirting, maybe she fancied the mechanic. Just a bit of green eyed jealousy?.
I'm a bit unsure how heavy flirting can get before ceasing to be harmless. Maybe you should write the guidelines!

I was very happy some years ago when a football playing teen briefly stopped the street game by calling to his mates to 'make way for the elderly'.

Oh dear, I realised my flirting days were over when I locked eyes with a handsome younger man in the supermarket and he looked quickly away as if I had embarrassed him.

Your friend was obviously jealous 66goodyear, ignore her and keep having fun. I am 64 and my bike is one of my favourite possessions, not that I can ride as far as you but there are many women in their seventies and older who cycle every day. Last year while on a ride with my grandson a man called out to me, "hello girlie." Later I told my DIL I hadn't been called girlie for a very long time, she thought that was funny. Male cyclist around my age often say hello when they pass, I am not good at flirting though.

It was only yesterday GD11 asked me to jump on the trampoline with her. I haven't jumped on a trampoline for a few years but was surprised at how this time it was easy to get into jumping again. It wasn't long before I was jumping up high (for me) and running around on it. I had to get my GD to sit while I jumped though, my balance isn't what it used to be.

I'm 63 and love to flirt with young men at festivals...especially if they have dreadlocks!!..never been rebuffed yet !

I think the only person being "ageist" here is OP who seems to think there is something unusual in a 49 year-old woman being attractive and attracted to the opposite sex!
"Stealth boast" is not a term I have come across before, but I am beginning to understand it now.

Daphne 'stealth boast' was new to me too, but I like it, and it seems to be almost, but not quite, synonymous with the relatively new term 'virtue signalling'.
Nice to be able to keep up, isn't it?

haven't flirted for a long time,don't think anyone would want to flirt with me,they look at me and see some old woman.Perhaps I need to change my attitude,I would love to be more like the person I was.It's nothing to do with being a Grandma,that is one of the best things in my life,I love having fun with my granddaughter.

The OP is joking. For heavens sake can't you see the humour in her description of herself.

For what it's worth 66goodyear I enjoyed reading your post and chuckled at your description of yourself.

No, I didn't see much genuine humour, only saw an indirect and long description of how marvellous she is in various ways.
I go on Mumsnet quite a lot, specially the Style and Beauty, and have to admit I picked up the term stealth boast there, when an OP is apparently asking for advice but actually boasting about how attractive/ rich she is or how many designer handbags or shoes she has. People who do that tend to get called out on it - usually politely.

Fit, healthy, all my own teeth and only a slightly dodgy pelvic floor.....this could be a description of me. I have also been known to flirt outrageously, esp. when I was in my Jezebel period.

Am I boasting or just stating facts about myself?

I think it's boasting when you post on social media to tell everyone about it, with the aim of impressing them. Just as it would be if you posted to say you were rich enough to have bought the latest It bag, or are incredibly attractive.

Having said that I guess the whole social media scene - Facebook, Instagram, etc - does encourage that sort of narcissism.

Aw does that mean I can't ask advice as to how to deal With youngish men I have to beat off with my Louis Vuitton handbag or the second best Mulberry and can anyone tell me how best to store my Manolo whatsit shoes? (I will have to check the boxes darlings as just what they are called).

Why are people getting so nasty about this post?

I get the impression that the poster was feeling quite good about herself (and what's wrong with that?) but her friend put a very definite damper on things. Not much of a friend I would say.

Friend was probably jealous.

Jaxie you may find there are plenty of older men who are happy to flirt (until their wife appears from the next aisle!).
Of course, many wives don't mind, their eyes just turn skywards.

Has 66goodyear been back to comment on her replies?

DH and I are in the process of converting an old transit into a campervan. I know that some members have mobile homes of various types that cost far more than I can afford. Am I to assume that they are boasting if we discuss campervans and motorhomes? I thought we were simply talking about something we all enjoy but perhaps I'm being naïve and they were putting me in my place for not being able to afford a 'proper' campervan. Actually I don't think they are. I have no problem with people who have more money than me telling me about their possessions or asking my opinion.

How do you know if someone is posting with an intention to impress or boast? Perhaps they're simply having a conversation.