HOTD: doing math in the number range of 1-60
This seems to be very difficult for the audience and showmakers alike and makes my nerd-self go:
So let's talk about the fucked up show timeline/character ages.
For once we will take word of God (Ryan Condal) as basis, who has said that Aegon II is 23 and Aemond is 19 as of episode 1.10.
Yes, this does most definitely contradict lines said on the show (means it has been 25 years since 1.1 not less than twenty), but we'll go with this now, because it actually makes some fucking sense. So from those two given ages we can infer other character ages as follows:
Alicent was 15 when she was married to Viserys and had Aegon with 16 (a pregnancy lasts nine month in Westeros too afawk), so Alicent and Rhaenyra are 38/39 years old. That means Daemon should be 53/54 if he is 15/16 years older than Rhaenyra like in the books (which is debated).
So King Viserys who is at least eight years older than Daemon on the show (in the books it's only four) was around 62 when he died. Otto should be around this age too, maybe a bit younger.
Rhaenys is a bit older than Viserys in the books and I think it's almost same age on the show too. (Corlys is not 78 on the show, more likely also somewhere around 60.)
Crispy Cole was "around 20" at the tourney, says Condal, so should be 45 now (damn he looks good for that). My guess is Mysaria, Larys and the Lannister twins are around that age too.
Helaena is square in the middle of her brothers so 21. Her twins are probably around 5, same age as Rhaenyra's Aegon, (LilVizzy 3?), Joffrey is going on 7. We'll see what they do with the young kids in season 2, as there might be retcons.
Jace and Baela should be 17/18 and Rhaena 15/16 if she isn't Baela's twin on the show. This seems to be left open to interpretation.
Some guesses for season 2:
They seem to have swapped who is older with Alyn and Addam like they already did with Laenor and Laena from the books. Despite the older actor I don't think Alyn will be forty like some people fear, because of his former roles, but around Aegon's II age (would fit with him being made in the first Stepstone's campaign and fighting in the second), so early to mid twenties and Addam late teens.
Hugh is rumored to either be Prince Baelon's or King Viserys' bastard. He will be in his early fourties, so a bit older than Rhaenyra, which makes me think Viserys is more likely. For maximum trolling they should make Ulf (Drunken Ursurper Cunt of a King 2.0) Daemon's bastard.
Nettles is definitely going to be aged up. Probably also early to mid twenties (and if they make her Laenor's 'not-for-lack-of-trying' bastard, then the bastard collection would be complete and I'll laugh my ass off).