There is no such thing as being 'past all that'. Tolerance levels, and bad habits can creep in and up over time. And the thing with having alcohol addiction and addicts in the family is that so often we don't 'know better' as a result, but instead have had unhealthy attitudes and practices with alcohol as a model, and normalised. And, of course, we can so often say, 'well, I'm not as bad as x, so yeah, I don't have a problem. That's what a problem looks like, and I'm not looking like that, so it's okay'.
For me, there's a couple of red flags that I watch for.
'I need alcohol to relax and wind down/ I need alcohol to go to sleep', is a big one - FOR ME.
Another one is when it starts to dominate thought patterns/ how I plan what I'm doing with the day, is another. E.g., I found myself worrying that I had a bottle of wine in for the evening, (or enough bottles of wine!), even very early on in the day. And, hand in hand with that, looking for things to justify drinking that evening - something bad happened in the day, something good, that sort of a thing. Or preferring not to go out, rather to stay at home and drink, that sort of thing.
If your DH is worried about your drinking enough to voice it, I'm guessing he's very worried - it's not an easy thing to bring up, because the response is unlikely to be good! He may have overly moderate ideas of what constitutes health attitudes and behaviours with alcohol, we don't know. But if it's impacting on him and your family, then they have a right to their opinions and feelings on the matter, and to voice them to you, hard as it can be to hear, and listen to.