AIBU to think 2 and a half is too old for a dummy?

[Discopanda]

Disclaimer- this is largely based on my own opinion, I just want to know if I should have a tactful word with the other mum or am just being a snob.

A girl I used to work with has a baby 3 weeks younger than mine so is now 2 and a half, she posts pictures of absolutely everything on Facebook and, no word of a lie, I have maybe seen 3-4 photos of him out of hundreds without a dummy. This kid CONSTANTLY has a dummy in his mouth; he's playing- dummy in the mouth, he's smiling- dummy in the mouth, he's sat in front of the TV- dummy in the mouth. I have no problem with dummies in general, they can be an absolute life saver for younger babies, mine had one but gave them up of her own accord at 10 months but my HV told me that a dummy should just be a last resort if they're upset as it can slow down speech and emotional development if you depend on them (because baby isn't expressing themselves and just being placated).

From what she's shared on FB it's quite obvious that he's behind on his speech for his age. WIBU to bring it up when I next see her and maybe suggest that they try cutting down on the dummy?

My MIL used to constantly bang on about our 2 older DC's having dummies beyond the age of 2 - they would be adults with attachment issues, bad teeth, no speech yadayada and DH got quite worried about it until FIL pointed out that no, MIL never had a dummy but at the grand old age of 63 still occasionally sucked her thumb and in fact had done throughout 40 years of marriage
We stopped taking her seriously at that point and none of our children ever shut up have any speech problems.
YABU, none of your concern and the child is certainly not too old for one.

I could see your point if you'd put at the age of 4 or 5, but at the age of TWO AND A HALF?
You need to pipe down and seriously mind your own. They're still a baby!
My first never had a dummy. Never entertained the idea. He'd have spat it straight out at you if you'd have tried.
2nd however, dummy fiend. Loved a dummy. We weaned him off the dummy at the age of 3. Just kept it for naps and bedtime and he soon dropped it altogether.
At the age of 2, for crying out loud they're still tiny.

I think that's a really stupid thing to worry about.
I wouldn't say anything to her.