I'm 14 years sober (40 years old). I've had various comments over the years:-
'Have a drink! Oh no, I forgot, you're boring, aren't you?' (This from an accountant who lives in the suburbs and whose conversation revolves around mortgage rates and house prices...)
'You could probably have just one now couldn't you? It's been such a long time it probably wouldn't affect you' (my DM, to whom the idea of going 24 hours without a drink is just terrifying.)
'Oh it's not got much alcohol in it, hardly any really. You can definitely have this.' (Ah, my MIL, bless her heart)
I've also been honest with the wrong people sometimes. I mentioned to a mum at the school gates who kept inviting me to come to the drinks evenings that they have that I don't go to that sort of thing because I'm a recovering alcoholic (I go out to bars and clubs sometimes, just not to evenings where I know the main point of it is to get ratted together - from what everyone looks like the morning after these 'drinks evenings' I know they tend to get a bit messy). Now I have to put up with her and a few of her mates giving me 'side head' and 'gentle sympathetic voice'... I didn't get to be 14 years sober by being fucking fragile FGS! But at least they've stopped going on at me to attend the drinks.
So, yeah sometimes you will get stupid comments. Sometimes you'll give an explanation that people will gossip about, and some people will pressure you - usually because they're uncomfortable about their own drinking. But the rewards are so worth it.
Usually I just say 'I don't drink alcohol' and most people leave it at that. If they don't, it's usually because they have an issue with alcohol and my being sober makes them uncomfortable so I try to have compassion for them and not be too snippy in my 'No thanks, I really don't want a drink'. Recently when someone pressured me about my drinking I was a bit too forceful and pointed out that two of my family members died of alcoholism last year (one of liver failure, one with Korsakoff's syndrome who died of oesophageal haemorrhage - both were in their late 40s and had kids). That caused an Awkward Silence, and I regret saying it but it was all a bit raw at the time and they were being an arse.
At most parties you can find me on the dancefloor - this means most people don't notice I haven't been drinking. In fact, the way I dance, they usually assume that I'm off my face 